The records of a department store show that 20% of their customers who make a purchase return the merchandise for exchange. If the distribution of the random variable x describing the number of purchases is binomial,
a) what is the probability that at least 2 customers return the merchandise for exchange?
b) what is the expected number and standard deviation of customers who return the merchandise for exchange?

Question

Quizplus · Accepted Answer

The Answer of The records of a department store show that 20% of their customers who make a purchase return the merchandise for exchange. If the distribution of the random variable x describing the number of purchases is binomial,
a) what is the probability that at least 2 customers return the merchandise for exchange?
b) what is the expected number and standard deviation of customers who return the merchandise for exchange?

The Records of a Department Store Show That 20% of Their