Answer:
a = 20
Step-by-step explanation:
The mean is calculated as
mean = [tex]\frac{sum}{count}[/tex]
= [tex]\frac{25+28+a+30+32}{5}[/tex] = [tex]\frac{115+a}{5}[/tex]
Then
[tex]\frac{115+a}{5}[/tex] = 27 ( multiply both sides by 5 to clear the fraction )
115 + a = 135 ( subtract 115 from both sides )
a = 20
