CUET Preparation Today
In a binomial distribution , the probability of getting success is $\frac{1}{5}$ and standard deviation is 4. Then, its mean is: |
20 25 100 12 |
20 |
The correct answer is Option (1) → 20 In a Binomial Distribution, the standard deviation is $σ=\sqrt{np(1-p)}$ $⇒4=\sqrt{n×0.2×(1-0.2)}$ $⇒16=n×0.2×0.8$ $⇒n=\frac{16}{0.2×0.8}=100$ $∴μ=np=0.2×100=20$ |
