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.

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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3. A random sample of 12 graduates of a certain secretarial school typed an average of 79.3 words
per minute with a standard deviation of 7.8 words per minute. Assuming a normal distribution
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.
Transcribed Image Text:3. A random sample of 12 graduates of a certain secretarial school typed an average of 79.3 words per minute with a standard deviation of 7.8 words per minute. Assuming a normal distribution 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.
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