From 6am to 9am customers arrive in... From 6am to 9am customers arrive in droves to Betty's Bakery for her annual, 1 day only, cake sale. During that 3 hour period 1.75 customers enters the Bakery every minute. Betty and her staff can box cakes and check out customers only at the rate of 70 customers per hour. What is the average waiting time (minutes) for the customers who arrive in this 3-hour period of time?

Tickets to a science exposition cost $5.75 each for studentd and $7.00 for adults. how many students and adults went if the ticket charge was $42.75

Acoin bank containing only dimes and quarters has 12 more dimes than quarters. the total value of the coins is $11. how many quarters and dimes are in the coin bank?

Suppose that 3% of all athletes are using the endurance-enhancing hormone epo (you should be able to simply compute the percentage of all athletes that are not using epo). for our purposes, a “positive” test result is one that indicates presence of epo in an athlete’s bloodstream. the probability of a positive result, given the presence of epo is .99. the probability of a negative result, when epo is not present, is .90. what is the probability that a randomly selected athlete tests positive for epo? 0.0297