Concept: For the binomial distribution of probability - Mean =np - Variance =npq Where n is the total number of cases, p is probability of favorable cases and q is probability of unfavorable cases(1 - p) Calculation: Given mean=np=
2
3
and variance =npq=
5
9
variance
mean
=
5
9
2
3
q=
5
6
p=1−q=
1
6
np=
2
3
n=4 ∴ The probability that random variable D=2 P=nC2p2qn−2 P=4C2×(