# Question

The average waiting time at a drive-in window of a local bank is 10.3 minutes, with a standard deviation of 2.7 minutes. Assume the variable is normally distributed. If a customer arrives at the bank, find the probability that the customer will have to wait

a. Between 4 and 9 minutes

b. Less than 5 minutes or more than 10 minutes

c. How might a customer estimate his or her approximate waiting time?

a. Between 4 and 9 minutes

b. Less than 5 minutes or more than 10 minutes

c. How might a customer estimate his or her approximate waiting time?

## Answer to relevant Questions

Newborn elephant calves usually weigh between 200 and 250 pounds—until October 2006, that is. An Asian elephant at the Houston (Texas) Zoo gave birth to a male calf weighing in at a whopping 384 pounds! Mack (like the ...A contractor decided to build homes that will include the middle 80% of the market. If the average size of homes built is 1810 square feet, find the maximum and minimum sizes of the homes the contractor should build. Assume ...Competency test for high school sophomores has a normal distribution with a mean of 400 and a standard deviation of 100. a. The top 3% of students receive $500. What is the minimum score you would need to receive this ...An instructor gives a 100-point examination in which the grades are normally distributed. The mean is 60 and the standard deviation is 10. If there are 5% A’s and 5% F’s, 15% B’s and 15% D’s, and 60% C’s, find the ...Full-time Ph.D. students receive an average of $12,837 per year. If the average salaries are normally distributed with a standard deviation of $1500, find these probabilities. a. The student makes more than $15,000. b. The ...Post your question

0