PSY 520 Graduate Statistics

Statistics by Witte & Witte (2017)

Chapter 5 Review Question #5.14

Question:

#5.14

For the normal distribution of burning times of electric light bulbs, with a mean equal to 1200 hours and a standard deviation equal to 120 hours, what burning time is identified with the

(a) upper 50 percent?

(b) lower 75 percent?

(c) lower 1 percent?

(d) middle 90 percent?

Thank you for your help!