Question 4 Let X be a normal random variable with a mean of 15 and a standard deviation of 3.Calculate the following values manually.Show all steps in your answers.(a) P(X >= 12) (b) P(X = 18) (d) P(5 < X Probability Distributions>Normal command.Cros

Question 4 Let X be a normal random variable with a mean of 15 and a standard deviation of 3.Calculate the following values manually.Show all steps in your answers.(a) P(X >= 12) (b) P(X = 18) (d) P(5 < X Probability Distributions>Normal command.Cros
Question 4
Let X be a normal random variable with a mean of 15 and a standard deviation of 3.Calculate the following values manually.Show all steps in your answers.
(a) P(X >= 12)
(b) P(X = 18)
(d) P(5 < X Probability Distributions>Normal command.Crosscheck your answers,comment on any differences and attach your output .
Question 5
The amount of money spent on textbooks per year by students enrolled in a business course is a normally distributed random variable with mean of $715 and a standard deviation of $25.Calculate the following values manually.Show all steps in your answers.
(a) What is the probability that a student spends between $415 and 650 per year?
(b) What percentage of students spends more than $750 on textbooks per year?
(c) What percentage of students spends less than $680 per year?
Do these three sub-questions on EXCEL/PHStat.Use the PHStat>Probability Distributions>Normal command.Crosscheck your answers,comment on any differences and attach your output .
Question 6
Fast Service Truck Lines uses the Ford Super Truck exclusively.A study revealed that the mean number of kilometres travelled per truck during the year was 60,000.The distances travelled were approximately normal with a standard deviation 2,000 kilometres.Calculate the following values manually.Show all steps in your answers.
(a) What proportion of the trucks would have logged 65,200 kilometres or more?
(b) The truck line owns 3,500 Ford Super Truck.How many of them do you think would have travelled at least 55,000 kilometres?Explain your reasoning.
(c) The truck line owns 3,500 Ford Super Truck.How many of the trucks do you think would have travelled no more than 62,000 kilometres during the year?
Do these three sub-questions on EXCEL/PHStat.Use the PHStat>Probability Distributions>Normal command.Crosscheck your answers,comment on any differences and attach your output .

Question 4 Let X be a normal random variable with a mean of 15 and a standard deviation of 3.Calculate the following values manually.Show all steps in your answers.(a) P(X >= 12) (b) P(X = 18) (d) P(5 < X Probability Distributions>Normal command.Cros
问题4 让X 是一个正常随机变量以手段15 和标准偏差3 .手工计算以下价值.显示所有步在您的答复. (a) P(X > = 12) (b) P(X = 18) (d) P(5 < x 可能性Distributions>Normal 命令.再确认您的答复, 评论所有区别和附有您的产品. 问题5 相当数量金钱花在课本上每年由学生注册在企业路线是一个通常分布的随机变量以手段$715 和标准偏差$25 .手工计算以下价值.显示所有步在您的答复. (a) 什么是学生花费在$415 和650 之间每年的可能性? (b) 什么学生的百分比在课本上花费超过$750 每年? (c) 什么学生的百分比花费少于$680 每年? 做对EXCEL/PHStat 的这些三个次级问题.使用PHStat>Probability Distributions>Normal 命令.再确认您的答复, 评论所有区别和附有您的产品. 问题6 快速的服务卡车完全排行用途福特超级卡车.研究显露, 公里的卑鄙数量旅行了每卡车在年期间是60,000 .距离旅行了是近似地正常的以标准偏差2,000 公里.手工计算以下价值.显示所有步在您的答复. (a) 卡车的什么比例会采伐65,200 公里或更多? (b) 卡车线拥有3,500 福特超级卡车.他们您认为多少会旅行至少55,000 公里? 解释您的推理. (c) 卡车线拥有3,500 福特超级卡车.卡车您认为多少会旅行没有比62,000 公里在年期间? 做对EXCEL/PHStat 的这些三个次级问题.使用PHStat>Probability Distributions>Normal 命令.再确认您的答复, 评论所有区别和附有您的产品.