Question

The probability is 0.7 that a person shopping at a certain store will spend less than $20. For random samples of 28 customers, find the mean number of shoppers who spend less than $20.

Answer 1

approximately 19~20 shopper

Explanation:

this case binomial distribution

X~B(n,p)

X: number of shoppers who spend less than 20$

n=28

p=0.7

use mean of binormal distribution E(X)=np

Answer)

E(x) =28*0.7=19.6

thus approximately 19~20 shopper