Question

If the mean of 25, 28, a, 30 and 32 is 27, then find the value of a.

Answer 1

Answer:

a = 20

Step-by-step explanation:

The mean is calculated as

mean = $\frac{sum}{count}$

          = $\frac{25+28+a+30+32}{5}$  = $\frac{115+a}{5}$

Then

$\frac{115+a}{5}$ = 27 ( multiply both sides by 5 to clear the fraction )

115 + a = 135 ( subtract 115 from both sides )

a = 20