The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. The expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. If the management decides to give free gifts to all those customers who spend more than $130 at this supermarket during a visit, what percentage of the customers are expected to get free gifts?
Answer to relevant QuestionsOne of the cars sold by Walt’s car dealership is a very popular subcompact car called Rhino. The final sale price of the basic model of this car varies from customer to customer depending on the negotiating skills and ...The lengths of 3-inch nails manufactured on a machine are normally distributed with a mean of 3.0 inches and a standard deviation of .009 inch. The nails that are either shorter than 2.98 inches or longer than 3.02 inches ...Let x be a continuous random variable that follows a normal distribution with a mean of 550 and a standard deviation of 75. a. Find the value of x so that the area under the normal curve to the left of x is .0250. b. Find ...For a binomial probability distribution, n = 25 and p = .40. a. Find the probability P(8 < x < 13) by using the table of binomial probabilities (Table I of Appendix C). b. Find the probability P(8 < x < 13) by using the ...According to a Gallup poll, 92% of Americans believe in God (Time, June 20, 2011). Suppose that this result is true for the current population of adult Americans. What is the probability that the number of adult Americans in ...
Post your question