Name: 1. The lengths of time bank customers must wait for a teller are normally distributed, with a mean of 3 minutes and a standard deviation of 2 minute. a. What proportion of bank customers waits between 3 and 4.5 minutes b. What percentage wait more than 4 minutes? c. What proportion waits between 2 and 3.5 minutes? d. What percentage wait less than 1 minute? 2. To estimate the medical charges for an appendectomy Blue Star Insurance has data from a random sample of 75 patients. The sample mean cost is $410, with a sample standard deviation of $90. Construct a 95% confidence interval for the population mean cost. We are 95% confident that the populations mean costs of patients' medical charges for an appendectomy through Blue Star Insurance range is between _____________ and ________________ 3. Democrat Republican Independent 10 15 65 Los Angeles 35 25 75 North Carolina 20 70 DC 60 A group of voters from 3 states were selected and the results are above. What is the probability of selecting a random voter from Los Angeles, given that the voter was a republican? a).357 b).417 c).267 d).200 4.. Democrat Republican Independent 10 15 65 Los Angeles 35 25 75 North Carolina 20 70 Maryland 60 A group of voters from 3 states were selected and the results are above. What is the probability of selecting a random voter that is from North Carolina or a Democrat? a).093 b).520 c).613 d).357 5. In 20 pulls from a deck of playing cards, 20 cards were red. What is the probability that on the 21 st pull the card will be red? a).5000 b).2500 c).000000477 d).03125