Homework Answers
Here X is the binomial variable with parameters n and p
where n denotes the number of orders that are sampled to be observed
=> n = 470
and p is the probability that a customer places an order online
=> p = 0.45
So, variance of binomial = np(1-p) = 470 x 0.45 x (1-0.45) = 116.33
Ans. D. 116.33
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