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(b) In a restaurant, the spending of a customer for lunch is known to follow a normal distribution with population mean of $80 and population standard deviation of $15. Suppose each customer will get a 10% off discount today. Find the median of customer spending for lunch in the restaurant after the discount. (c) Mary is doing some research about the number of hours spent on social media per week by primary school kids and secondary school kids. She reads a report that mentions the standard deviation of time spent on social media by primary school kids is 2.6 hours. In another report it mentions that the variance of time spent on social media by secondary school kids is 4.84 hours². Which group of students, primary school kids or secondary school kids, has a greater variation in terms of number of hours spent on social media per week?

(b) In a restaurant, the spending of a customer for lunch is known to follow a normal distribution with population mean of $80 and population standard deviation of $15. Suppose each customer will get a 10% off discount today. Find the median of customer spending for lunch in the restaurant after the discount. (c) Mary is doing some research about the number of hours spent on social media per week by primary school kids and secondary school kids. She reads a report that mentions the standard deviation of time spent on social media by primary school kids is 2.6 hours. In another report it mentions that the variance of time spent on social media by secondary school kids is 4.84 hours². Which group of students, primary school kids or secondary school kids, has a greater variation in terms of number of hours spent on social media per week?

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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just do part b) and part c)

(a) Write down the name of the sampling method for each of the following cases: (i) Every 30th product in the production line is selected for quality control. (ii) Fair representatives of staffs are selected randomly from different departments to conduct a survey about the gender distribution. (iii) Students are selected based on random numbers to take place in a survey about their favorite subjects. (b) In a restaurant, the spending of a customer for lunch is known to follow a normal distribution with population mean of $80 and population standard deviation of $15. Suppose each customer will get a 10% off discount today. Find the median of customer spending for lunch in the restaurant after the discount. (c) Mary is doing some research about the number of hours spent on social media per week by primary school kids and secondary school kids. She reads a report that mentions the standard deviation of time spent on social media by primary school kids is 2.6 hours. In another report it mentions that the variance of time spent on social media by secondary school kids is 4.84 hours?. Which group of students, primary school kids or secondary school kids, has a greater variation in terms of number of hours spent on social media per week?
Transcribed Image Text:(a) Write down the name of the sampling method for each of the following cases: (i) Every 30th product in the production line is selected for quality control. (ii) Fair representatives of staffs are selected randomly from different departments to conduct a survey about the gender distribution. (iii) Students are selected based on random numbers to take place in a survey about their favorite subjects. (b) In a restaurant, the spending of a customer for lunch is known to follow a normal distribution with population mean of $80 and population standard deviation of $15. Suppose each customer will get a 10% off discount today. Find the median of customer spending for lunch in the restaurant after the discount. (c) Mary is doing some research about the number of hours spent on social media per week by primary school kids and secondary school kids. She reads a report that mentions the standard deviation of time spent on social media by primary school kids is 2.6 hours. In another report it mentions that the variance of time spent on social media by secondary school kids is 4.84 hours?. Which group of students, primary school kids or secondary school kids, has a greater variation in terms of number of hours spent on social media per week?
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