Basic Math Examples

74

$74$ ,

79

$79$ ,

82

$82$ ,

73

$73$ ,

90

$90$ ,

81

$81$ ,

88

$88$ ,

91

$91$ ,

76

$76$ ,

92

$92$ ,

89

$89$ ,

72

$72$ ,

78

$78$ ,

87

$87$ ,

84

$84$

Step 1

The mean of a set of numbers is the sum divided by the number of terms.

\frac{74 + 79 + 82 + 73 + 90 + 81 + 88 + 91 + 76 + 92 + 89 + 72 + 78 + 87 + 84}{15}

$\frac{74 + 79 + 82 + 73 + 90 + 81 + 88 + 91 + 76 + 92 + 89 + 72 + 78 + 87 + 84}{15}$

Step 2

Simplify the numerator.

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Step 2.1

Add

74

$74$ and

79

$79$ .

\frac{153 + 82 + 73 + 90 + 81 + 88 + 91 + 76 + 92 + 89 + 72 + 78 + 87 + 84}{15}

$\frac{153 + 82 + 73 + 90 + 81 + 88 + 91 + 76 + 92 + 89 + 72 + 78 + 87 + 84}{15}$

Step 2.2

Add

153

$153$ and

82

$82$ .

\frac{235 + 73 + 90 + 81 + 88 + 91 + 76 + 92 + 89 + 72 + 78 + 87 + 84}{15}

$\frac{235 + 73 + 90 + 81 + 88 + 91 + 76 + 92 + 89 + 72 + 78 + 87 + 84}{15}$

Step 2.3

Add

235

$235$ and

73

$73$ .

\frac{308 + 90 + 81 + 88 + 91 + 76 + 92 + 89 + 72 + 78 + 87 + 84}{15}

$\frac{308 + 90 + 81 + 88 + 91 + 76 + 92 + 89 + 72 + 78 + 87 + 84}{15}$

Step 2.4

Add

308

$308$ and

90

$90$ .

\frac{398 + 81 + 88 + 91 + 76 + 92 + 89 + 72 + 78 + 87 + 84}{15}

$\frac{398 + 81 + 88 + 91 + 76 + 92 + 89 + 72 + 78 + 87 + 84}{15}$

Step 2.5

Add

398

$398$ and

81

$81$ .

\frac{479 + 88 + 91 + 76 + 92 + 89 + 72 + 78 + 87 + 84}{15}

$\frac{479 + 88 + 91 + 76 + 92 + 89 + 72 + 78 + 87 + 84}{15}$

Step 2.6

Add

479

$479$ and

88

$88$ .

\frac{567 + 91 + 76 + 92 + 89 + 72 + 78 + 87 + 84}{15}

$\frac{567 + 91 + 76 + 92 + 89 + 72 + 78 + 87 + 84}{15}$

Step 2.7

Add

567

$567$ and

91

$91$ .

\frac{658 + 76 + 92 + 89 + 72 + 78 + 87 + 84}{15}

$\frac{658 + 76 + 92 + 89 + 72 + 78 + 87 + 84}{15}$

Step 2.8

Add

658

$658$ and

76

$76$ .

\frac{734 + 92 + 89 + 72 + 78 + 87 + 84}{15}

$\frac{734 + 92 + 89 + 72 + 78 + 87 + 84}{15}$

Step 2.9

Add

734

$734$ and

92

$92$ .

\frac{826 + 89 + 72 + 78 + 87 + 84}{15}

$\frac{826 + 89 + 72 + 78 + 87 + 84}{15}$

Step 2.10

Add

826

$826$ and

89

$89$ .

\frac{915 + 72 + 78 + 87 + 84}{15}

$\frac{915 + 72 + 78 + 87 + 84}{15}$

Step 2.11

Add

915

$915$ and

72

$72$ .

\frac{987 + 78 + 87 + 84}{15}

$\frac{987 + 78 + 87 + 84}{15}$

Step 2.12

Add

987

$987$ and

78

$78$ .

\frac{1065 + 87 + 84}{15}

$\frac{1065 + 87 + 84}{15}$

Step 2.13

Add

1065

$1065$ and

87

$87$ .

\frac{1152 + 84}{15}

$\frac{1152 + 84}{15}$

Step 2.14

Add

1152

$1152$ and

84

$84$ .

\frac{1236}{15}

$\frac{1236}{15}$

Step 3

Cancel the common factor of

$1236$ and

$15$ .

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Step 3.1

Factor

$3$ out of

$1236$ .

$\frac{3 (412)}{15}$

Step 3.2

Cancel the common factors.

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Step 3.2.1

Factor

$3$ out of

$15$ .

$\frac{3 \cdot 412}{3 \cdot 5}$

Step 3.2.2

Cancel the common factor.

$\frac{3 \cdot 412}{3 \cdot 5}$

Step 3.2.3

Rewrite the expression.

$\frac{412}{5}$

Step 4

Divide.

$82.4$