If 15 students in a class average 80% on an English exam and 10 students average 90% on the same ...

If 15 students in a class average 80% on an English exam and 10 students average 90% on the same exam, what is the average in percent for all 25 students?

Quiz

Answer/Solution

84%

Steps/Work

The average percentage = (15 x 80% + 10 x 90%)/25
= (15 x 80% + 10x 80% + 10x10%) / 25 ......(as 90% = 10% + 80% )
=(25x80% + 10x10%)/25
= 80% + 10x10%/25
= 80% + 4%
= 84%
ANSWER:C

General Calculator / Auto Solver

If students in a class average % on an english exam and students average % on the same exam, what is the average in percent for all students?

Calculated Answer

84

Step by Step Solution

In order to solve problem, you must evaluate (n0 * n1 + n2 * n3) / n4.

n0 =15
n1 =80
n2 =10
n3 =90
n4 =25