Question 2 An online shopping company promises that fresh food order will be delivered to a household within 90 minutes. The marketing manager of the company reviews the delivery time of all orders in the last month and finds that the delivery time follows a normal distribution with mean delivery time of 77.5 minutes and standard deviation of 10.5 minutes. (a) Find the probability that an order can be delivered to the customer before the promise time. (b) The marketing manager wants to adjust the promise time from 90 minutes to a new level: K minutes, so that only 0.3% of the orders would arrive after K' minutes. What should the value of K be? (Round off your answer to the nearest minute.) (c) If the delivery time of each order will be reduced by 2.5%. Find the new mean and new standard deviation of the delivery time after the change.
Question 2 An online shopping company promises that fresh food order will be delivered to a household within 90 minutes. The marketing manager of the company reviews the delivery time of all orders in the last month and finds that the delivery time follows a normal distribution with mean delivery time of 77.5 minutes and standard deviation of 10.5 minutes. (a) Find the probability that an order can be delivered to the customer before the promise time. (b) The marketing manager wants to adjust the promise time from 90 minutes to a new level: K minutes, so that only 0.3% of the orders would arrive after K' minutes. What should the value of K be? (Round off your answer to the nearest minute.) (c) If the delivery time of each order will be reduced by 2.5%. Find the new mean and new standard deviation of the delivery time after the change.
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
Related questions
Question
Transcribed Image Text:時图片
目单页的双页,日连续阅读
背景,
划词翻译
截屏。
压缩
全屏显示
播放
Question 2
An online shopping company promises that fresh food order will be delivered to a household within 90 minutes.
The marketing manager of the company reviews the delivery time of all orders in the last month and finds that
the delivery time follows a normal distribution with mean delivery time of 77.5 minutes and standard deviation
of 10.5 minutes.
(a) Find the probability that an order can be delivered to the customer before the promise time.
(b) The marketing manager wants to adjust the promise time from 90 minutes to a new level: K minutes, so
that only 0.3% of the orders would arrive after K' minutes. What should the value of K be? (Round off
your answer to the nearest minute.)
(c) If the delivery time of each order will be reduced by 2.5%. Find the new mean and new standard
deviation of the delivery time after the change.
> >I
0本地备份开
回口D
日
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 4 steps with 8 images
Recommended textbooks for you
Glencoe Algebra 1, Student Edition, 9780079039897…
Algebra
ISBN:
9780079039897
Author:
Carter
Publisher:
McGraw Hill
Glencoe Algebra 1, Student Edition, 9780079039897…
Algebra
ISBN:
9780079039897
Author:
Carter
Publisher:
McGraw Hill