I have two homework problems I don't really know where to start or how to do them. If some one could help I would be greatly appreciative.
1) The baggage weights for passengers using a particular airline are normally distributed with a mean of 20lbs and a standard deviation of 4lbs. If the limit on total luggage weight is 2125 lbs, what is the probability that the limit will be exceeded for 100 passengers?
2) A unhappy post office customer is disturbed with the waiting time to buy stamps. Upon registering his complaint he was told the average waiting time in the pas has been about 4 min with a standard deviation of 2 min. The customer collected a sample of n=45 customers and found the mean wait time was 5.3 min. Find the 95% confidence interval for the mean waiting time. Assume the standard deviation is a known value.
1) The baggage weights for passengers using a particular airline are normally distributed with a mean of 20lbs and a standard deviation of 4lbs. If the limit on total luggage weight is 2125 lbs, what is the probability that the limit will be exceeded for 100 passengers?
2) A unhappy post office customer is disturbed with the waiting time to buy stamps. Upon registering his complaint he was told the average waiting time in the pas has been about 4 min with a standard deviation of 2 min. The customer collected a sample of n=45 customers and found the mean wait time was 5.3 min. Find the 95% confidence interval for the mean waiting time. Assume the standard deviation is a known value.