Author Question: CampusFest is a student festival where local businesses come on campus to sell their goods to ... (Read 14 times)

laurencescou · **on:** Jul 24, 2018

CampusFest is a student festival where local businesses come on campus to sell their goods to students at vastly reduced prices.

As part of a give-away promotion, a local cellular phone company gave away 300 cellular phones to students who signed up for their calling service. Unbeknownst to the company is that 20 of these cellular phones were faulty and will cause a small explosion when dialed outside the local calling area. Suppose you and your roommate each received one of the giveaway phones. Find the probability that both of you received faulty phones. Round to five decimal places when necessary. A) 0.00424 B) 0.00444 C) 0.13333 D) 0.06243

Question 2

Construct a 95 confidence interval for the population mean, . Assume the population has a normal distribution. A sample of 20 part-time workers had mean annual earnings of 3120 with a standard deviation of 677. Round to the nearest dollar.

A) (2803, 3437 ) B) (1324, 1567 ) C) (2135, 2567 ) D) (2657, 2891 )