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1. In the first semester of the year 2003, the average return for a group of 251 investing companies was 4.5% and the standard deviation was 1.5%. If a sample of 40 companies is randomly selected from this group, what is the approximate probability that the average return of the companies in this sample was between 4% and 5% in the first semester of the year 2003?

1. In the first semester of the year 2003, the average return for a group of 251 investing companies was 4.5% and the standard deviation was 1.5%. If a sample of 40 companies is randomly selected from this group, what is the approximate probability that the average return of the companies in this sample was between 4% and 5% in the first semester of the year 2003?

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
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2. 1. In the first semester of the year 2003, the average return for a group of 251 investing companies was 4.5% and the standard deviation was 1.5%. If a sample of 40 companies is randomly selected from this group, what is the approximate probability that the 6. average return of the companies in this sample was between 4% and 5% in the first semester of the year 2003? 08. 6. Z = 10 n340 11 12 13 14 P( ) 15 dec 16 17 3. 4. 7.
Transcribed Image Text:2. 1. In the first semester of the year 2003, the average return for a group of 251 investing companies was 4.5% and the standard deviation was 1.5%. If a sample of 40 companies is randomly selected from this group, what is the approximate probability that the 6. average return of the companies in this sample was between 4% and 5% in the first semester of the year 2003? 08. 6. Z = 10 n340 11 12 13 14 P( ) 15 dec 16 17 3. 4. 7.
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