Question

A class of 25 students took a science test .10 students have an average (arithmetic mean)score of 80.the other students had an average score of 60.what is the average score of whole class?

Answer 1

Step-by-step explanation:

Given

Average score of 10 Student=80

So,Total sum of score of 10 stu=80*10=800

or,Average of other 15 students =60

Total score of 15 students=60*15=900

Total score of 25 students=800+900=1700

Then,

Average of 25 students =1700/25

=68