Basic Math Examples

81

$81$ ,

73

$73$ ,

84

$84$ ,

77

$77$

Step 1

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

\frac{81 + 73 + 84 + 77}{4}

$\frac{81 + 73 + 84 + 77}{4}$

Step 2

Simplify the numerator.

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Step 2.1

Add

81

$81$ and

73

$73$ .

\frac{154 + 84 + 77}{4}

$\frac{154 + 84 + 77}{4}$

Step 2.2

Add

154

$154$ and

84

$84$ .

\frac{238 + 77}{4}

$\frac{238 + 77}{4}$

Step 2.3

Add

238

$238$ and

77

$77$ .

\frac{315}{4}

$\frac{315}{4}$

\frac{315}{4}

$\frac{315}{4}$

Step 3

Divide.

78.75

$78.75$

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.

78.8

$78.8$

81, 73, 84, 77

$81, 73, 84, 77$

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