a) A class of 25 boys and girls had a Mean Arithmetic mark of 12. The 15
boys in the class had a mean mark of 14. What was the mean mark of the
girls ?
Answers
Answered by
2
Answer:
girls mean mark = 9
Step-by-step explanation:
total marks of boys and girls =25x12 =300
total marks of boys =15x14= 210
total marks of girls =300-210=90
mean mark of girls =90/10=9
Answered by
0
Answer:
10
Step-by-step explanation:
mean = sum of amount of objects / no of objects
mean = boys + girls / 2
12 ( given ) = 14 + girls / 2
12 × 2 = 14 + girls
24 - 14 = girls
girls mark = 10
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