Answer:

Mean=2.1
Standard deviation=1.21
Explanation:
We are given that
n=7
Probability of success, p=0.3
q=1-p=1-0.3=0.7
We have to find the probability of 3 success for the binomial experiment and find the mean and standard deviation.
Binomial distribution formula

Using the formula




Using the formula


Now,
Mean,

Standard deviation,

Standard deviation,

Standard deviation,
