Statistics And Probability Question 361
Question: The mean mark in statistics of 100 students in a class was 72. The mean mark of boys was 75. While their number was 70. The mean mark of girls in the class was
Options:
A) 65
B) 60
C) 66
D) 62
Show Answer
Answer:
Correct Answer: A
Solution:
[a] $ \frac{70\times 75+30\times x}{100}=72\Rightarrow x=65 $
BETA
