Only need help with c d and e

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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Only need help with c d and e

Expert Solution
Step 1

Consider,

Population mean (µ) = 10

Population standard deviation (σ) = 127

Sample size (n) = 63

The null and alternative hypotheses are:

Probability homework question answer, step 1, image 1

Step 2

For the 99% confidence level, the critical value for left tailed test is -1.56.

(c)

To the compute the test statistic value, z -test is to be used because population standard deviation is known.

Further,

The sample mean, can be calculated as:

Probability homework question answer, step 2, image 1

steps

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