3. A random sample of 12 graduates of a certain secretarial school typed an average of 79.3 wordsper minute with a standard deviation of 7.8 words per minute. Assuming a normal distributionfor the number of words typed per minute, Find:a.93% confidence interval for the average number of words typed by all graduates of thisschool.

Sample size=n=12 df=n-1= 11 Sample mean = x ¯ = 79.3 words per minute Standard deviation =s= 7.8…

Answered: for the number of words typed per…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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for the number of words typed per minute, Find: a. 93% confidence interval for the average number of words typed by all graduates of this school.