Basic Math Examples

s = [65, 90, 85, 70, 70, 95, 55]

$s = [65, 90, 85, 70, 70, 95, 55]$

Step 1

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

\frac{65 + 90 + 85 + 70 + 70 + 95 + 55}{7}

$\frac{65 + 90 + 85 + 70 + 70 + 95 + 55}{7}$

Step 2

Simplify the numerator.

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Step 2.1

Add

65

$65$ and

90

$90$ .

\frac{155 + 85 + 70 + 70 + 95 + 55}{7}

$\frac{155 + 85 + 70 + 70 + 95 + 55}{7}$

Step 2.2

Add

155

$155$ and

85

$85$ .

\frac{240 + 70 + 70 + 95 + 55}{7}

$\frac{240 + 70 + 70 + 95 + 55}{7}$

Step 2.3

Add

240

$240$ and

70

$70$ .

\frac{310 + 70 + 95 + 55}{7}

$\frac{310 + 70 + 95 + 55}{7}$

Step 2.4

Add

310

$310$ and

70

$70$ .

\frac{380 + 95 + 55}{7}

$\frac{380 + 95 + 55}{7}$

Step 2.5

Add

380

$380$ and

95

$95$ .

\frac{475 + 55}{7}

$\frac{475 + 55}{7}$

Step 2.6

Add

475

$475$ and

55

$55$ .

\frac{530}{7}

$\frac{530}{7}$

\frac{530}{7}

$\frac{530}{7}$

Step 3

Divide.

75.71428571

$75.71428571$

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.

75.7

$75.7$