Find the Mean 77 , 79 , 65 , 67 , 70 , 63 , 81 , 70 , 69 , 64 , 69 , 74 , 76 , 85 , 71

$77$ , $79$ , $65$ , $67$ , $70$ , $63$ , $81$ , $70$ , $69$ , $64$ , $69$ , $74$ , $76$ , $85$ , $71$

Step 1

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

$\frac{77 + 79 + 65 + 67 + 70 + 63 + 81 + 70 + 69 + 64 + 69 + 74 + 76 + 85 + 71}{15}$

Step 2

Simplify the numerator.

Add $77$ and $79$ .

$\frac{156 + 65 + 67 + 70 + 63 + 81 + 70 + 69 + 64 + 69 + 74 + 76 + 85 + 71}{15}$

Add $156$ and $65$ .

$\frac{221 + 67 + 70 + 63 + 81 + 70 + 69 + 64 + 69 + 74 + 76 + 85 + 71}{15}$

Add $221$ and $67$ .

$\frac{288 + 70 + 63 + 81 + 70 + 69 + 64 + 69 + 74 + 76 + 85 + 71}{15}$

Add $288$ and $70$ .

$\frac{358 + 63 + 81 + 70 + 69 + 64 + 69 + 74 + 76 + 85 + 71}{15}$

Add $358$ and $63$ .

$\frac{421 + 81 + 70 + 69 + 64 + 69 + 74 + 76 + 85 + 71}{15}$

Add $421$ and $81$ .

$\frac{502 + 70 + 69 + 64 + 69 + 74 + 76 + 85 + 71}{15}$

Add $502$ and $70$ .

$\frac{572 + 69 + 64 + 69 + 74 + 76 + 85 + 71}{15}$

Add $572$ and $69$ .

$\frac{641 + 64 + 69 + 74 + 76 + 85 + 71}{15}$

Add $641$ and $64$ .

$\frac{705 + 69 + 74 + 76 + 85 + 71}{15}$

Add $705$ and $69$ .

$\frac{774 + 74 + 76 + 85 + 71}{15}$

Add $774$ and $74$ .

$\frac{848 + 76 + 85 + 71}{15}$

Add $848$ and $76$ .

$\frac{924 + 85 + 71}{15}$

Add $924$ and $85$ .

$\frac{1009 + 71}{15}$

Add $1009$ and $71$ .

$\frac{1080}{15}$

Step 3

Divide $1080$ by $15$ .

$72$