Matemática básica Ejemplos

$52$ , $51$ , $49$ , $48$ , $32$ , $31$ , $25$ , $23$ , $15$ , $13$ , $13$ , $11$ , $9$ , $4$

Paso 1

La media de un conjunto de números es la suma dividida por la cantidad de términos.

$\overline{x} = \frac{52 + 51 + 49 + 48 + 32 + 31 + 25 + 23 + 15 + 13 + 13 + 11 + 9 + 4}{14}$

Paso 2

Simplifica el numerador.

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Paso 2.1

Suma $52$ y $51$ .

$\overline{x} = \frac{103 + 49 + 48 + 32 + 31 + 25 + 23 + 15 + 13 + 13 + 11 + 9 + 4}{14}$

Paso 2.2

Suma $103$ y $49$ .

$\overline{x} = \frac{152 + 48 + 32 + 31 + 25 + 23 + 15 + 13 + 13 + 11 + 9 + 4}{14}$

Paso 2.3

Suma $152$ y $48$ .

$\overline{x} = \frac{200 + 32 + 31 + 25 + 23 + 15 + 13 + 13 + 11 + 9 + 4}{14}$

Paso 2.4

Suma $200$ y $32$ .

$\overline{x} = \frac{232 + 31 + 25 + 23 + 15 + 13 + 13 + 11 + 9 + 4}{14}$

Paso 2.5

Suma $232$ y $31$ .

$\overline{x} = \frac{263 + 25 + 23 + 15 + 13 + 13 + 11 + 9 + 4}{14}$

Paso 2.6

Suma $263$ y $25$ .

$\overline{x} = \frac{288 + 23 + 15 + 13 + 13 + 11 + 9 + 4}{14}$

Paso 2.7

Suma $288$ y $23$ .

$\overline{x} = \frac{311 + 15 + 13 + 13 + 11 + 9 + 4}{14}$

Paso 2.8

Suma $311$ y $15$ .

$\overline{x} = \frac{326 + 13 + 13 + 11 + 9 + 4}{14}$

Paso 2.9

Suma $326$ y $13$ .

$\overline{x} = \frac{339 + 13 + 11 + 9 + 4}{14}$

Paso 2.10

Suma $339$ y $13$ .

$\overline{x} = \frac{352 + 11 + 9 + 4}{14}$

Paso 2.11

Suma $352$ y $11$ .

$\overline{x} = \frac{363 + 9 + 4}{14}$

Paso 2.12

Suma $363$ y $9$ .

$\overline{x} = \frac{372 + 4}{14}$

Paso 2.13

Suma $372$ y $4$ .

$\overline{x} = \frac{376}{14}$

Paso 3

Cancela el factor común de $376$ y $14$ .

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Paso 3.1

Factoriza $2$ de $376$ .

$\overline{x} = \frac{2 (188)}{14}$

Paso 3.2

Cancela los factores comunes.

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Paso 3.2.1

Factoriza $2$ de $14$ .

$\overline{x} = \frac{2 \cdot 188}{2 \cdot 7}$

Paso 3.2.2

Cancela el factor común.

$\overline{x} = \frac{2 \cdot 188}{2 \cdot 7}$

Paso 3.2.3

Reescribe la expresión.

$\overline{x} = \frac{188}{7}$

Paso 4

Divide.

$\overline{x} = 26.85714285$

Paso 5

La media debería redondearse a una cifra decimal más que los datos originales. Si los datos originales fueran mixtos, redondea a una cifra decimal más que el dato menos preciso.

$\overline{x} = 26.9$

Paso 6

Establece la fórmula para la varianza. La varianza de un conjunto de valores es una medida de la propagación de sus valores.

$s^{2} = \sum_{i = 1}^{n} \frac{{(x_{i} - x_{a v g})}^{2}}{n - 1}$

Paso 7

Establece la fórmula para la varianza de este conjunto de números.

$s = \frac{{(52 - 26.9)}^{2} + {(51 - 26.9)}^{2} + {(49 - 26.9)}^{2} + {(48 - 26.9)}^{2} + {(32 - 26.9)}^{2} + {(31 - 26.9)}^{2} + {(25 - 26.9)}^{2} + {(23 - 26.9)}^{2} + {(15 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(11 - 26.9)}^{2} + {(9 - 26.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8

Simplifica el resultado.

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Paso 8.1

Simplifica el numerador.

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Paso 8.1.1

Resta $26.9$ de $52$ .

$s = \frac{{25.1}^{2} + {(51 - 26.9)}^{2} + {(49 - 26.9)}^{2} + {(48 - 26.9)}^{2} + {(32 - 26.9)}^{2} + {(31 - 26.9)}^{2} + {(25 - 26.9)}^{2} + {(23 - 26.9)}^{2} + {(15 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(11 - 26.9)}^{2} + {(9 - 26.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.2

Eleva $25.1$ a la potencia de $2$ .

$s = \frac{630.01 + {(51 - 26.9)}^{2} + {(49 - 26.9)}^{2} + {(48 - 26.9)}^{2} + {(32 - 26.9)}^{2} + {(31 - 26.9)}^{2} + {(25 - 26.9)}^{2} + {(23 - 26.9)}^{2} + {(15 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(11 - 26.9)}^{2} + {(9 - 26.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.3

Resta $26.9$ de $51$ .

$s = \frac{630.01 + {24.1}^{2} + {(49 - 26.9)}^{2} + {(48 - 26.9)}^{2} + {(32 - 26.9)}^{2} + {(31 - 26.9)}^{2} + {(25 - 26.9)}^{2} + {(23 - 26.9)}^{2} + {(15 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(11 - 26.9)}^{2} + {(9 - 26.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.4

Eleva $24.1$ a la potencia de $2$ .

$s = \frac{630.01 + 580.81 + {(49 - 26.9)}^{2} + {(48 - 26.9)}^{2} + {(32 - 26.9)}^{2} + {(31 - 26.9)}^{2} + {(25 - 26.9)}^{2} + {(23 - 26.9)}^{2} + {(15 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(11 - 26.9)}^{2} + {(9 - 26.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.5

Resta $26.9$ de $49$ .

$s = \frac{630.01 + 580.81 + {22.1}^{2} + {(48 - 26.9)}^{2} + {(32 - 26.9)}^{2} + {(31 - 26.9)}^{2} + {(25 - 26.9)}^{2} + {(23 - 26.9)}^{2} + {(15 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(11 - 26.9)}^{2} + {(9 - 26.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.6

Eleva $22.1$ a la potencia de $2$ .

$s = \frac{630.01 + 580.81 + 488.41 + {(48 - 26.9)}^{2} + {(32 - 26.9)}^{2} + {(31 - 26.9)}^{2} + {(25 - 26.9)}^{2} + {(23 - 26.9)}^{2} + {(15 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(11 - 26.9)}^{2} + {(9 - 26.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.7

Resta $26.9$ de $48$ .

$s = \frac{630.01 + 580.81 + 488.41 + {21.1}^{2} + {(32 - 26.9)}^{2} + {(31 - 26.9)}^{2} + {(25 - 26.9)}^{2} + {(23 - 26.9)}^{2} + {(15 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(11 - 26.9)}^{2} + {(9 - 26.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.8

Eleva $21.1$ a la potencia de $2$ .

$s = \frac{630.01 + 580.81 + 488.41 + 445.21 + {(32 - 26.9)}^{2} + {(31 - 26.9)}^{2} + {(25 - 26.9)}^{2} + {(23 - 26.9)}^{2} + {(15 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(11 - 26.9)}^{2} + {(9 - 26.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.9

Resta $26.9$ de $32$ .

$s = \frac{630.01 + 580.81 + 488.41 + 445.21 + {5.1}^{2} + {(31 - 26.9)}^{2} + {(25 - 26.9)}^{2} + {(23 - 26.9)}^{2} + {(15 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(11 - 26.9)}^{2} + {(9 - 26.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.10

Eleva $5.1$ a la potencia de $2$ .

$s = \frac{630.01 + 580.81 + 488.41 + 445.21 + 26.01 + {(31 - 26.9)}^{2} + {(25 - 26.9)}^{2} + {(23 - 26.9)}^{2} + {(15 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(11 - 26.9)}^{2} + {(9 - 26.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.11

Resta $26.9$ de $31$ .

$s = \frac{630.01 + 580.81 + 488.41 + 445.21 + 26.01 + {4.1}^{2} + {(25 - 26.9)}^{2} + {(23 - 26.9)}^{2} + {(15 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(11 - 26.9)}^{2} + {(9 - 26.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.12

Eleva $4.1$ a la potencia de $2$ .

$s = \frac{630.01 + 580.81 + 488.41 + 445.21 + 26.01 + 16.81 + {(25 - 26.9)}^{2} + {(23 - 26.9)}^{2} + {(15 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(11 - 26.9)}^{2} + {(9 - 26.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.13

Resta $26.9$ de $25$ .

$s = \frac{630.01 + 580.81 + 488.41 + 445.21 + 26.01 + 16.81 + {(- 1.9)}^{2} + {(23 - 26.9)}^{2} + {(15 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(11 - 26.9)}^{2} + {(9 - 26.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.14

Eleva $- 1.9$ a la potencia de $2$ .

$s = \frac{630.01 + 580.81 + 488.41 + 445.21 + 26.01 + 16.81 + 3.61 + {(23 - 26.9)}^{2} + {(15 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(11 - 26.9)}^{2} + {(9 - 26.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.15

Resta $26.9$ de $23$ .

$s = \frac{630.01 + 580.81 + 488.41 + 445.21 + 26.01 + 16.81 + 3.61 + {(- 3.9)}^{2} + {(15 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(11 - 26.9)}^{2} + {(9 - 26.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.16

Eleva $- 3.9$ a la potencia de $2$ .

$s = \frac{630.01 + 580.81 + 488.41 + 445.21 + 26.01 + 16.81 + 3.61 + 15.21 + {(15 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(11 - 26.9)}^{2} + {(9 - 26.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.17

Resta $26.9$ de $15$ .

$s = \frac{630.01 + 580.81 + 488.41 + 445.21 + 26.01 + 16.81 + 3.61 + 15.21 + {(- 11.9)}^{2} + {(13 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(11 - 26.9)}^{2} + {(9 - 26.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.18

Eleva $- 11.9$ a la potencia de $2$ .

$s = \frac{630.01 + 580.81 + 488.41 + 445.21 + 26.01 + 16.81 + 3.61 + 15.21 + 141.61 + {(13 - 26.9)}^{2} + {(13 - 26.9)}^{2} + {(11 - 26.9)}^{2} + {(9 - 26.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.19

Resta $26.9$ de $13$ .

$s = \frac{630.01 + 580.81 + 488.41 + 445.21 + 26.01 + 16.81 + 3.61 + 15.21 + 141.61 + {(- 13.9)}^{2} + {(13 - 26.9)}^{2} + {(11 - 26.9)}^{2} + {(9 - 26.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.20

Eleva $- 13.9$ a la potencia de $2$ .

$s = \frac{630.01 + 580.81 + 488.41 + 445.21 + 26.01 + 16.81 + 3.61 + 15.21 + 141.61 + 193.21 + {(13 - 26.9)}^{2} + {(11 - 26.9)}^{2} + {(9 - 26.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.21

Resta $26.9$ de $13$ .

$s = \frac{630.01 + 580.81 + 488.41 + 445.21 + 26.01 + 16.81 + 3.61 + 15.21 + 141.61 + 193.21 + {(- 13.9)}^{2} + {(11 - 26.9)}^{2} + {(9 - 26.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.22

Eleva $- 13.9$ a la potencia de $2$ .

$s = \frac{630.01 + 580.81 + 488.41 + 445.21 + 26.01 + 16.81 + 3.61 + 15.21 + 141.61 + 193.21 + 193.21 + {(11 - 26.9)}^{2} + {(9 - 26.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.23

Resta $26.9$ de $11$ .

$s = \frac{630.01 + 580.81 + 488.41 + 445.21 + 26.01 + 16.81 + 3.61 + 15.21 + 141.61 + 193.21 + 193.21 + {(- 15.9)}^{2} + {(9 - 26.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.24

Eleva $- 15.9$ a la potencia de $2$ .

$s = \frac{630.01 + 580.81 + 488.41 + 445.21 + 26.01 + 16.81 + 3.61 + 15.21 + 141.61 + 193.21 + 193.21 + 252.81 + {(9 - 26.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.25

Resta $26.9$ de $9$ .

$s = \frac{630.01 + 580.81 + 488.41 + 445.21 + 26.01 + 16.81 + 3.61 + 15.21 + 141.61 + 193.21 + 193.21 + 252.81 + {(- 17.9)}^{2} + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.26

Eleva $- 17.9$ a la potencia de $2$ .

$s = \frac{630.01 + 580.81 + 488.41 + 445.21 + 26.01 + 16.81 + 3.61 + 15.21 + 141.61 + 193.21 + 193.21 + 252.81 + 320.41 + {(4 - 26.9)}^{2}}{14 - 1}$

Paso 8.1.27

Resta $26.9$ de $4$ .

$s = \frac{630.01 + 580.81 + 488.41 + 445.21 + 26.01 + 16.81 + 3.61 + 15.21 + 141.61 + 193.21 + 193.21 + 252.81 + 320.41 + {(- 22.9)}^{2}}{14 - 1}$

Paso 8.1.28

Eleva $- 22.9$ a la potencia de $2$ .

$s = \frac{630.01 + 580.81 + 488.41 + 445.21 + 26.01 + 16.81 + 3.61 + 15.21 + 141.61 + 193.21 + 193.21 + 252.81 + 320.41 + 524.41}{14 - 1}$

Paso 8.1.29

Suma $630.01$ y $580.81$ .

$s = \frac{1210.82 + 488.41 + 445.21 + 26.01 + 16.81 + 3.61 + 15.21 + 141.61 + 193.21 + 193.21 + 252.81 + 320.41 + 524.41}{14 - 1}$

Paso 8.1.30

Suma $1210.82$ y $488.41$ .

$s = \frac{1699.23 + 445.21 + 26.01 + 16.81 + 3.61 + 15.21 + 141.61 + 193.21 + 193.21 + 252.81 + 320.41 + 524.41}{14 - 1}$

Paso 8.1.31

Suma $1699.23$ y $445.21$ .

$s = \frac{2144.44 + 26.01 + 16.81 + 3.61 + 15.21 + 141.61 + 193.21 + 193.21 + 252.81 + 320.41 + 524.41}{14 - 1}$

Paso 8.1.32

Suma $2144.44$ y $26.01$ .

$s = \frac{2170.45 + 16.81 + 3.61 + 15.21 + 141.61 + 193.21 + 193.21 + 252.81 + 320.41 + 524.41}{14 - 1}$

Paso 8.1.33

Suma $2170.45$ y $16.81$ .

$s = \frac{2187.26 + 3.61 + 15.21 + 141.61 + 193.21 + 193.21 + 252.81 + 320.41 + 524.41}{14 - 1}$

Paso 8.1.34

Suma $2187.26$ y $3.61$ .

$s = \frac{2190.87 + 15.21 + 141.61 + 193.21 + 193.21 + 252.81 + 320.41 + 524.41}{14 - 1}$

Paso 8.1.35

Suma $2190.87$ y $15.21$ .

$s = \frac{2206.08 + 141.61 + 193.21 + 193.21 + 252.81 + 320.41 + 524.41}{14 - 1}$

Paso 8.1.36

Suma $2206.08$ y $141.61$ .

$s = \frac{2347.69 + 193.21 + 193.21 + 252.81 + 320.41 + 524.41}{14 - 1}$

Paso 8.1.37

Suma $2347.69$ y $193.21$ .

$s = \frac{2540.9 + 193.21 + 252.81 + 320.41 + 524.41}{14 - 1}$

Paso 8.1.38

Suma $2540.9$ y $193.21$ .

$s = \frac{2734.11 + 252.81 + 320.41 + 524.41}{14 - 1}$

Paso 8.1.39

Suma $2734.11$ y $252.81$ .

$s = \frac{2986.92 + 320.41 + 524.41}{14 - 1}$

Paso 8.1.40

Suma $2986.92$ y $320.41$ .

$s = \frac{3307.33 + 524.41}{14 - 1}$

Paso 8.1.41

Suma $3307.33$ y $524.41$ .

$s = \frac{3831.74}{14 - 1}$

Paso 8.2

Simplifica la expresión.

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Paso 8.2.1

Resta $1$ de $14$ .

$s = \frac{3831.74}{13}$

Paso 8.2.2

Divide $3831.74$ por $13$ .

$s = 294.74923076$

Paso 9

Aproxima el resultado.

$s^{2} \approx 294.7492$