Question

U/8 Points DETAILS PREVIOUS ANSWERS DEVURESTA19 5...052.NVA The lifetime of a certain type of battery is normally distributed with mean value 13 hours and standard deviation 1 hour. There are nine batteries in a package. What lifetime value is such that the total lifetime of all batteries in a package exceeds that value for only 5% of all packages? (Round your answer to two decimal places.) 14.65 hours Sud Work Romeo Last Response

Answer 1

of life time ol certain type battery normally distributed mean (u) = 13 and Standard deviation ( ol al hours. 9 batteries in a package z = 7-u on. The valve for only 5 of all packages Li P ( cx) 0.05. Z value for this probability is :. Z -1.6 45. X-M xxt 2 = 2 T t M. in - 1.645 X + 13 sa x = 12.45 - hours at which of all batteries The value is 12.45 the total life time exceeds only s% for at all packages. Please like.