# Question

During 2004, the average number of flying hours for aircraft operated by regional airlines in the United States was 2389. Assume a normal distribution and a standard deviation of 300 hours. Source: Statistical Abstract of the United States 2006, p. 701.

a. What proportion of aircraft flew more than 2200 hours during the year?

b. What proportion of aircraft flew between 2000 and 2400 hours during the year?

c. What number of annual flying hours was exceeded by only 15% of the aircraft?

d. What number of annual flying hours was exceeded by 75% of the aircraft?

a. What proportion of aircraft flew more than 2200 hours during the year?

b. What proportion of aircraft flew between 2000 and 2400 hours during the year?

c. What number of annual flying hours was exceeded by only 15% of the aircraft?

d. What number of annual flying hours was exceeded by 75% of the aircraft?

## Answer to relevant Questions

During fiscal 2008, the average daily volume for FedEx Corporation was 7,000,000 packages per day. Assuming a normal distribution and a standard deviation of 800,000 packages per day, on what proportion of the days was the ...A researcher is studying a particular process and has identified the following times, in minutes, between consecutive occurrences: 1.8, 4.3, 2.3, 2.1, 5.6, 1.5, 4.5, 1.8, 2.4, 2.6, 3.2, 3.5, 1.6, 2.1, and 1.9. Given this ...The trainer for a professional football team has found that, on the average, his team experiences 2.3 sprained ankles per 1000 game minutes. If a game lasts 60 minutes, and the number of game minutes between ankle sprains is ...If x is normally distributed with μ = 25.0 and σ = 5.0, determine the following: a. P(x ≥ 25.0) b. P(20.0 ≤ x ≤ 30.0) c. P(x ≤ 30) d. P(x = 26.2) e. P(15.0 ≤ x ≤ 25.0) f. P(x ≥ 15) A hardware store chain has just received a truckload of 5000 electric drills. Before accepting the shipment, the purchasing manager insists that 9 of the drills be randomly selected for testing. He intends to measure the ...Post your question

0