just need assistance with part b, part A was easy.

this isnt a tutor work. it is a question and im tring to answer. just need a little help as I have already done part A

AutoSave . OFF ~ 4 6 565 : MAT10251 Special Exam Resit Exam Study Period 4 2020 Online - Saved to my Mac Home Insert Draw Design Layout References Mailings Review View Tell me Share Comments Calibri (BO... ~ 12 A" A Aa A AaBbCcDdE AaBbCCD AaBbCcDdi AaBbCcDdl AaBbCcDdEt AaBb Paste BIUvab x x A LA . Emphasis Heading 1 Normal Strong Subtitle Title Styles Dictate Sensitivity Pane Question 6 (17 Marks) Research has shown that Earth_Wise energy efficient LED light bulbs have a lifespan of 30,000 hours with a standard deviation of 6,000 hours (a) Assume that the lifespan of Earth_Wise LED light bulbs is normally distributed. What is the probability that a randomly selected bulb has a lifespan of (1) more than 24,000 hour. Sort ii) between 25,000 and 40,000 hours? (b ) Assume that the lifespan of Earth_Wise LED light bulbs is not normally distributed. (8) Random samples of 36 bulbs are selected. Specify the mean, standard deviation and distribution of the sampling distribution of the mean lifespan of samples of 36 bulbs. (11) Calculate the probability that the mean lifespan of 36 Earth_Wise LED light bulbs recently installed in a new house is less than 29,500 hours. Solution Question 6 Page 11 of 27 986 words English (United States) Focus E + 121%