Answer: Mean = 8 and standard deviation is 2.77
Explanation:
The mean and standard deviation for a binomial distribution is given by :-
, where n is the sample size and p is the probability of getting success.
Given : The proportion of the lightbulbs produced at Shady Stan's lightbulb factory are defective: p=0.04
Sample size :

Then , the mean and standard deviation for a binomial distribution is given by :-
