Correct Answer – A
Given box contains 15 green and 10 yellow balls.
`:. Total number of balls `=15+10=25`
P(green balls)=`(15)/(25)=(3)/(5)`=p=Probability of success
P(yellow balls)`=(10)/(25)=(2)/(5)=q`=Probability of unsuccess and n=10=Number of trials.
`:. “Variance” =npq=10xx(3)/(5)xx(2)/(5)=(12)/(5)`

Correct Answer – B
`P=15/25,q=10/25,n=10`
`sigma^(2)=npq=10.””3/5.2/5=12/5`

Correct Answer – B