Homework 6

1. A sample of 5 different calculators is randomly selected from a group containing 6 that are defective and 9 that have no defects. Assume that the sample is taken with replacement. What is the probability that at least one of the calculators is defective? Express your answer as a percentage rounded to the nearest hundredth without the % sign.

2.  Use the data in the following​ table, which lists​ drive-thru order accuracy at popular fast food chains. Assume that orders are randomly selected from those included in the table. ​

Drive-thru Restaurant  /  A  /  B  /  C  /  D
Order Accurate         / 41 / 11 / 34 / 18
Order Not Accurate     / 17 / 27 / 12 / 9

If one order is​ selected, find the probability of getting an order from Restaurant C given the order that is accurate. Express your answer as a percentage rounded to the nearest hundredth without the % sign.

3.  In the town of Maplewood a certain type of DVD player is sold at just two stores. 51% of the sales are from store A and the rest of the sales are from store B. 9% of the DVD players sold at store A are defective while 3% of the DVD players sold at store B are defective. If Kate receives one of these DVD players as a gift and finds that it is defective, what is the probability that it came from store A? Express your answer as a percentage rounded to the nearest hundredth without the % sign.

Homework 6 Answers

1. A sample of 5 different calculators is randomly selected from a group containing 6 that are defective and 9 that have no defects. Assume that the sample is taken with replacement. What is the probability that at least one of the calculators is defective? Express your answer as a percentage rounded to the nearest hundredth without the % sign.

Answer

92.22