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Having more than 1,000 students in a year, assume that I choose a simple random samples of 30 final exams in my engineering economics class and compute the class average. The results show that 5% of the grades are over 2.1 and 5% are under 1.9. Using this information, determine (i) the population mean and (ii) the population standard deviation of the final exam.

Having more than 1,000 students in a year, assume that I choose a simple random samples of 30 final exams in my engineering economics class and compute the class average. The results show that 5% of the grades are over 2.1 and 5% are under 1.9. Using this information, determine (i) the population mean and (ii) the population standard deviation of the final exam.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 3GP
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Having more than 1,000 students in a year, assume that I choose a simple random samples of 30 final exams in my engineering economics class and compute the class average. The results show that 5% of the grades are over 2.1 and 5% are under 1.9. Using this information, determine (i) the population mean and (ii) the population standard deviation of the final exam.
Transcribed Image Text:Having more than 1,000 students in a year, assume that I choose a simple random samples of 30 final exams in my engineering economics class and compute the class average. The results show that 5% of the grades are over 2.1 and 5% are under 1.9. Using this information, determine (i) the population mean and (ii) the population standard deviation of the final exam.
Do NOT use EXCEL O a) (i) 4 (ii) 0.43 b) None of the answers are correct O c) (i) 2 (ii) 0.33 O d) (i) 3 (ii) 0.53 O e) (i) 6 (ii) 0.13
Transcribed Image Text:Do NOT use EXCEL O a) (i) 4 (ii) 0.43 b) None of the answers are correct O c) (i) 2 (ii) 0.33 O d) (i) 3 (ii) 0.53 O e) (i) 6 (ii) 0.13
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