Suppose the amount of time X that it takes for a cell phone to charge is normally
Question:
Suppose the amount of time X that it takes for a cell phone to charge is normally distributed with a mean of 10 hours and a variance of 2.25 hours. Find the probability, make a graph by shading the area according to the probability, and express your answer as a sentence using the context of the exercise.
(a) The probability that a cell phone will be charged in more than 8 hours
(b) The probability that a cell phone will be charged in less than 12 hours
(c) The probability that a cell phone will be charged in more than 8.5 and less than 10.5 hours
(d) The time specifications in which 95% of the phones are charged; that is, the values of X between which there is a probability of 0.95.
Business Statistics a decision making approach
ISBN: 978-0133021844
9th edition
Authors: David F. Groebner, Patrick W. Shannon, Phillip C. Fry