5) Out of 30 students the 13 boys had a mean average score of 65% in their last science test. All 30 students in the class had a mean average score of 72%. Find the mean average of the girls. Give your answer to 2dp.
Answers
Answered by
0
Answer:
total students=30
total boys=13
mean of boys =65%
observation of boys=65%of 13
=65/100*13
=8.45
mean of all students=72%
observation of all students =72%of 30
=72/100*30
=21.6
total girls=30-13=17
observation of girls=21.6-8.45=13.15
mean average of girls=13.15/17
=0.77
Similar questions