# What is the average for 85 72 97 81 77 93 100 75 86 70 96 80

Borys Shumyatskiy | Certified Educator

Average is equal to (sum of all numbers)/(count of numbers).

Here count = 12, sum = (85 + 72 + 97 + 81 + 77 + 93 + 100 + 75 + 86 + 70 + 96 + 80) =
(157 + 178 + 170 + 175 + 156 + 176) =
(335 + 345 + 332) = 900 + 100 + 12 = 1012.

So the average is 1012/12 = 253/3 = 84 and 1/3 = 84,3333(3)... or approx. 84.33.

dkoprowski | Student

First you want to add up all of the numbers. Your sum will be 1,012. Next, we need to divide the sum by the total number of numbers you added. Therefore it would be 1,012 / 12, which is 84.3.

balajia | Student

Average= (sum of quantities)/(no of quantities)``

sum of quantities = 85+72+97+81+77+93+100+75+86+70+96+80

no of quantities=12

Average= (1012)/12 =84.33

kseddy123 | Student

Let the given set be `i_(k) =` {85,72,97,81 ,77 ,93,100, 75, 86, 70, 96, 80}

Average of "n" numbers in a set  is calculated by = (sum of all n numbers)/ n

= `(sum_(k=1)^n(i_(k)))/n`

Here n=12

sum of 12 numbers

= 85 + 72 + 97 + 81 + 77 + 93 + 100 + 75 + 86 + 70 + 96 + 80

= 1012

Now average is

Average of these 12 numbers = ` (sum_(k=1)^n(i_(k)))/n `

`=1012/12`

`= 84.3333 =84.34 `

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