Suppose that the duration of a particular type of criminal trial is known to be normally distributed with a mean of 22 days and a standard deviation of 4 days. Let X be the number of days for a randomly selected trial. Round all answers to 4 decimal places where possible. Only need help on questions B, C, and D

A First Course in Probability (10th Edition)
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Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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Suppose that the duration of a particular type of criminal trial is known to be normally distributed with a mean of 22 days and a standard deviation of 4 days. Let X be the number of days for a randomly selected trial. Round all answers to 4 decimal places where possible. Only need help on questions B, C, and D
Suppose that the duration of a particular type of criminal trial is known to be normally distributed with a
mean of 22 days and a standard deviation of 4 days. Let X be the number of days for a randomly selected
trial. Round all answers to 4 decimal places where possible.
a. What is the distribution of X? X N( 22
b. If one of the trials is randomly chosen, find the probability that it lasted at least 21 days.
c. If one of the trials is randomly chosen, find the probability that it lasted between 21 and 26 days.
d. 81% of all of these types of trials are completed within how many days? (Please enter a whole number)
Transcribed Image Text:Suppose that the duration of a particular type of criminal trial is known to be normally distributed with a mean of 22 days and a standard deviation of 4 days. Let X be the number of days for a randomly selected trial. Round all answers to 4 decimal places where possible. a. What is the distribution of X? X N( 22 b. If one of the trials is randomly chosen, find the probability that it lasted at least 21 days. c. If one of the trials is randomly chosen, find the probability that it lasted between 21 and 26 days. d. 81% of all of these types of trials are completed within how many days? (Please enter a whole number)
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