When an opinion poll calls landline telephone numbers at random, approximately 35% of the numbers are working residential phone numbers. The remainder are either non-residential, non-working, or computer/fax numbers. You watch the random dialing machine make 20 calls. (Round your following answers to four decimal places. (a) What is the probability that fewer than 4 calls reach working residential numbers? (b) What is the probability that more than 4 calls reach working residential numbers? (c)Consumer Reports rated airlines and found that 84% of the flights involved in the study arrived on time (that is, within 15 minutes of scheduled arrival time). Assuming that the on-time arrival rate is representative of the entire commercial airline industry, consider a random sample of 188 flights. What is the expected number that will arrive on time? What is the standard deviation of this distribution? (Use 2 decimal places.)
When an opinion poll calls landline telephone numbers at random, approximately 35% of the numbers are working residential phone numbers. The remainder are either non-residential, non-working, or computer/fax numbers. You watch the random dialing machine make 20 calls. (Round your following answers to four decimal places. (a) What is the probability that fewer than 4 calls reach working residential numbers? (b) What is the probability that more than 4 calls reach working residential numbers? (c)Consumer Reports rated airlines and found that 84% of the flights involved in the study arrived on time (that is, within 15 minutes of scheduled arrival time). Assuming that the on-time arrival rate is representative of the entire commercial airline industry, consider a random sample of 188 flights. What is the expected number that will arrive on time? What is the standard deviation of this distribution? (Use 2 decimal places.)
Chapter8: Sequences, Series,and Probability
Section8.7: Probability
Problem 50E: Flexible Work Hours In a recent survey, people were asked whether they would prefer to work flexible...
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When an opinion poll calls landline telephone numbers at random, approximately 35% of the numbers are working residential phone numbers. The remainder are either non-residential, non-working, or computer/fax numbers. You watch the random dialing machine make 20 calls. (Round your following answers to four decimal places.
(a) What is the
(b) What is the probability that more than 4 calls reach working residential numbers?
(c)Consumer Reports rated airlines and found that 84% of the flights involved in the study arrived on time (that is, within 15 minutes of scheduled arrival time). Assuming that the on-time arrival rate is representative of the entire commercial airline industry, consider a random sample of 188 flights. What is the expected number that will arrive on time? What is the standard deviation of this distribution? (Use 2 decimal places.)
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