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Do Homework-Ashlyn Wright Google Chrome Secure I https//www mathtcom/Student/PlayerHomework.aspx 750671448oquestionld 68flushed false&ld-49406548ce; Ashyn wirgt &1 32818 6:53 PM MBA 6300, Spring II 2018 Online, CRN 21013 Homework: Chapter 7 Homework Save Score: 0 of 13 pts 8cf8(7 complete) HW Score: 68 6% 68 6 of 100 pts X7.1.55 Question Heip * At a certain coffee shop, all the customers buy a cup of coffee and some also buy a doughnut. The shop owner believes that the number of cups he sells each day is noemally distributed with a mean of 330 cups and a standard deviation of 24 cups He aiso believes that the number of doughmuts he sels each day is independent of the coffee sales and is normally distmbuted with a mean of 180 doughnuts and a standard deviation of 11. Complete parts aj through c) a) The shop is open every day but Sunday Assuming day-to-day sales ae independent, whars the probably he over 2 cups of cofw n a week? se Round to three decimal places as needed) Enter your answer in the answer box and then caek Check Answer Adobe Case Study Ds Tax 2017 Wight Let.. Pooi

Explanation / Answer

Total days are 6
mean = 6 * 330 = 1980
Variance = 6 * 24^2= 3456
std.dev = sqrt(3456) = 58.79

z = ( x - mean) / s
= (2000 - 1980) / 58.79
= 0.3402

P(x > 2000) = p(z > 0.3402) = 0.3669 by using z standard right tail table

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