There are 100 student in a class 40 of them are girls. The average marks of the boys in science is 75% and that of girls is 65% find the average marks of the class in science.
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Answered by
67
total number of students = 100
number of girls =40
number of boys =100-40=60
average mark of boy in science =75%
let the maximum marks in science be 100
sum of total marks secured by boy 60*75=4500
average mark of girls =65%
sum of total mark secure by girl =40*65=2600
thus the average mark of class=4500+2600/100
the ans is =71%
number of girls =40
number of boys =100-40=60
average mark of boy in science =75%
let the maximum marks in science be 100
sum of total marks secured by boy 60*75=4500
average mark of girls =65%
sum of total mark secure by girl =40*65=2600
thus the average mark of class=4500+2600/100
the ans is =71%
Answered by
4
Answer:
71
Step-by-step explanation:
Total marks of boys = 60 × 75 = 4500
Total marks of girls = 40 × 65 = 2600
Sum of total marks of the class = 4500 + 2600 = 7100
∴ Mean marks of the class in Science = 7100/100
= 71
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