Complete the following:
Q1.) The distribution of weights for a sample of 1,400 cargo containers is somewhat normal. Based on the Empirical Rule, what percent of weights will be
A.) Between the mean and plus or minus twice the standard deviation,
B.) Between the mean and minus one standard deviation, and
C.) Between the mean and three standard deviation
Q2.) Dan Woodard is the owner and manager of Dan's Truck Stop. Dan offers free refills on all coffee orders. He gathered the following information on coffee refills: there is a 30% chance that a customer will not get a refill, a 40% chance that a customer will get one refill, a 20% chance that a customer will get two refills, and a 10% chance that a customer will get three refills. How many refills can Dan expect a customer to get?
Q3.) WNAE finds that the distribution fo the length of time listeners are tuned to the station is normal, with a mean of 15 minutes and a standard deviation of 3.5 minutes. What is the probability that a particular listener will tune for.
A.) More than 20 minutes
B.) For 20 minutes, or less
C.) Between, 10 and 12 minutes
Q4.) The monthly sales of muffles in Richmond, VA area follow a normal distribution, with a mean of 1,200 and a standard deviation of 225. The manufacturer want to establish inventory levels such that there is no more than a 5% chance of running out of stock. What level should the manufacturer select as the minimum inventory level?