JEE Main Solved Paper 2017 Question 26
Question: A box contains 15 green and 10 yellow balls. If 10 balls are randomly drawn, one-by-one, with replacement, then the variance of the number of green balls drawn is :- [JEE Main Solved Paper-2017]
Options:
A) $ \frac{6}{25} $
B) $ \frac{12}{5} $
C) 6
D) 4
Show Answer
Answer:
Correct Answer: B
Solution:
- We can apply binomial probability distribution Variance = npq $ =10\times \frac{3}{5}\times \frac{2}{5}=\frac{12}{5} $
