Question

In: Math

Below is a list of the top nine longest serving U.S. Supreme Court Justices, along with...

  1. Below is a list of the top nine longest serving U.S. Supreme Court Justices, along with the current Chief Justice of the court:

Name                         Length of Service (in years)

William O. Douglas              36

Stephen Johnson Field      34

John Paul Stevens              34

John Marshall                      34

Hugo Black                           34

John Marshall Harlan         33

William J. Brennan              33

Joseph Story                         33

James Moore Wayne          32

John Roberts                          13

Please provide the following information (1 pt. each):

a. M years of service

b. SD years of service

c. Probability of observing the term length of John Roberts

Solutions

Expert Solution

a)

The mean for year of service time is obtained using the formula,

Where, X is the length of service time for judges.

From the data values,

Name Length of Service (in years)
William O. Douglas 36
Stephen Johnson Field 34
John Paul Stevens 34
John Marshall 34
Hugo Black 34
John Marshall Harlan 33
William J. Brennan 33
Joseph Story 33
James Moore Wayne 32
John Roberts 13
Sum 316

b)

The standard deviation for the year of service times is obtained using the formula,

Length of Service (in years), X
36 4.4 19.36
34 2.4 5.76
34 2.4 5.76
34 2.4 5.76
34 2.4 5.76
33 1.4 1.96
33 1.4 1.96
33 1.4 1.96
32 0.4 0.16
13 -18.6 345.96
Sum 394.4

c)

Let the data values are normally distributed with parameters, mean M and standard deviation, SD.

The probability of obtaining the length of service of John Roberts is obtained by calculating the z score

The probability for z score is obtained in excel using the function =NORM.S.DIST(-2.8097,FALSE)


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