(a) Sam and Peter are classmates. In an examination, Sam gets 75 marks and Peter gets 89 marks. It isknown that the standard normal score of Sam's marks is 0, ZSum) = 0 and the standard normal score ofPeter's marks is 1.75, zPeter) = 1.75. Find the standard deviation of the examination marks.(b) The table below indicates the number of refund cases and the average amount of refund per case inJanuary to March by a department store:JanuaryFebruaryMarchNumber of refund cases1212received in a monthAverage amount of refund$660$780$1000per case in a monthFind the overall average amount of refund per case between January and March.(c) In a city, the consumer price index in 2015, 2016, and 2017 were 100, 108.5, and 113.5 respectively.Find the percentage change of price from 2016 to 2017.(d) Write down the name of the sampling method for the following cases:(di) A fair representative of staff members is selected randomly from different education levels toconduct a survey on the relationship between promotion prospects and education level.(dii) The first student of every 10 students who leave a lecture hall is asked to comment on the teachingeffectiveness of the lesson.

It is given that Marks for Sam = 75 Marks for Peter = 89 Z(Sam) = 0 Z(Peter) = 1.75 Note : Since you…

Answered: (a) Sam and Peter are elassmates. In an…

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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Todd just got back his exam grades in three classes. In biology the class mean was 75.80 with a standard deviation of 5.15, Todd got an 84.00. In political science the class mean was 84.00 with a standard deviation of 5.50, Todd got an 84.00. In economics the class mean was 87.50 with a standard deviation of 5.60, Todd got a 84.00. 10. What percentage of the economics class scores higher than Todd? 11. Which class is Todd doing best in? State how you determined your answer. 12. Which class is Todd doing worst in? State how you determined your answer.

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(a) Sam and Peter are elassmates. In an examination, Sam gets 75 marks and Peter gets 89 marks. It is known that the standard normal score of Sam's marks is 0, zsam-0 and the standard normal score of Peter's marks is 1.75, z 1.75. Find the standard deviation of the examination marks.