Answer: Mean = 5.25
Variance = 1.3125
Standard deviation = 1.456
Step-by-step explanation:
The mean and variance of a binomial distribution with parameters n (number of trials) and p ( the probability of getting success in each trial) is given by :-

Given : The total number of enter a clothing store : n=7
The probability of a customer making a purchase= 0.75
Now,



hope this helps!
p.s. can i have brainliest?
Answer:
(_1,_7),(_2,_6),(_3,_5),(_4,_4)(_5,_3)