Question

In a binomial distribution, if n = 20 and q = 0.75, then write its mean.

Answer 1

n= 20 , q =0.75

$$\begin{gathered} \Rightarrow p=1-q=0.25 \\ \mathrm{Mean}=np=20(0.25)=5 \\ \mathrm{Thus},\mathrm{mean}=5 \end{gathered}$$