Find the mean and variance of the number of heads in the two tosses of a coin.

Answer

N/a

Explanation

In two tosses of a coin, the sample space
`S={HH,HT,TH,"TT"}`
Let `X` is a random variable which represents the number of tails obtained.

Mean `barX=sumX.P(X)=1`
Variance `sigma^(2)=sumx^(2).P(X)-(barX)^(2)`
`=3/2-(1)^(2)=1/2`
Standard deviation `(sigma)`
`=sqrt(1/2)=(sqrt(2))/2=1.414/2=00707`