Basic Math Examples

55

$55$ ,

92

$92$ ,

55

$55$ ,

88

$88$ ,

55

$55$ ,

82

$82$ ,

63

$63$ ,

83

$83$ ,

65

$65$ ,

77

$77$ ,

66

$66$ ,

71

$71$ ,

67

$67$

Step 1

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

\frac{55 + 92 + 55 + 88 + 55 + 82 + 63 + 83 + 65 + 77 + 66 + 71 + 67}{13}

$\frac{55 + 92 + 55 + 88 + 55 + 82 + 63 + 83 + 65 + 77 + 66 + 71 + 67}{13}$

Step 2

Simplify the numerator.

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Step 2.1

Add

55

$55$ and

92

$92$ .

\frac{147 + 55 + 88 + 55 + 82 + 63 + 83 + 65 + 77 + 66 + 71 + 67}{13}

$\frac{147 + 55 + 88 + 55 + 82 + 63 + 83 + 65 + 77 + 66 + 71 + 67}{13}$

Step 2.2

Add

147

$147$ and

55

$55$ .

\frac{202 + 88 + 55 + 82 + 63 + 83 + 65 + 77 + 66 + 71 + 67}{13}

$\frac{202 + 88 + 55 + 82 + 63 + 83 + 65 + 77 + 66 + 71 + 67}{13}$

Step 2.3

Add

202

$202$ and

88

$88$ .

\frac{290 + 55 + 82 + 63 + 83 + 65 + 77 + 66 + 71 + 67}{13}

$\frac{290 + 55 + 82 + 63 + 83 + 65 + 77 + 66 + 71 + 67}{13}$

Step 2.4

Add

290

$290$ and

55

$55$ .

\frac{345 + 82 + 63 + 83 + 65 + 77 + 66 + 71 + 67}{13}

$\frac{345 + 82 + 63 + 83 + 65 + 77 + 66 + 71 + 67}{13}$

Step 2.5

Add

345

$345$ and

82

$82$ .

\frac{427 + 63 + 83 + 65 + 77 + 66 + 71 + 67}{13}

$\frac{427 + 63 + 83 + 65 + 77 + 66 + 71 + 67}{13}$

Step 2.6

Add

427

$427$ and

63

$63$ .

\frac{490 + 83 + 65 + 77 + 66 + 71 + 67}{13}

$\frac{490 + 83 + 65 + 77 + 66 + 71 + 67}{13}$

Step 2.7

Add

490

$490$ and

83

$83$ .

\frac{573 + 65 + 77 + 66 + 71 + 67}{13}

$\frac{573 + 65 + 77 + 66 + 71 + 67}{13}$

Step 2.8

Add

573

$573$ and

65

$65$ .

\frac{638 + 77 + 66 + 71 + 67}{13}

$\frac{638 + 77 + 66 + 71 + 67}{13}$

Step 2.9

Add

638

$638$ and

77

$77$ .

\frac{715 + 66 + 71 + 67}{13}

$\frac{715 + 66 + 71 + 67}{13}$

Step 2.10

Add

715

$715$ and

66

$66$ .

\frac{781 + 71 + 67}{13}

$\frac{781 + 71 + 67}{13}$

Step 2.11

Add

781

$781$ and

71

$71$ .

\frac{852 + 67}{13}

$\frac{852 + 67}{13}$

Step 2.12

Add

852

$852$ and

67

$67$ .

\frac{919}{13}

$\frac{919}{13}$

\frac{919}{13}

$\frac{919}{13}$

Step 3

Divide.

70.69230769

$70.69230769$

Step 4

The mean should be rounded to one more decimal place than the original data. If the original data were mixed, round to one decimal place more than the least precise.

70.7

$70.7$