An experiment succeeds twice as often as it fails. The chance that in the next six trials, there shall be atleast four successes is
A probability distribution in which mean is equal to variance is
The mean and variance of a binomial distribution are 8 and 4 respectively. Then P(X=1) is equal to
The height of persons in a country is a random variable of the type
E(X−k)2 is minimum when
Var(2X± 3) if Var(X)=1 is
