Suppose that the duration of a particular type of criminal trial is known to be normally distributed with a mean of 20 days and a standard deviation of 6 days. Let X be the number of days for a randomly selected trial. Round all answers to 4 decimal places where possible.

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I need the answer for Part 2 of a, b and c. Thank you

### Duration of Criminal Trials - Normal Distribution

Suppose that the duration of a particular type of criminal trial is known to be normally distributed with a mean of 20 days and a standard deviation of 6 days. Let \( X \) be the number of days for a randomly selected trial. Round all answers to 4 decimal places where possible.

#### Question Part (a)
**Question:** 
What is the distribution of \( X \)?

**Answer:**
\( X \sim N \left( \mu = 20, \sigma = 6 \right)  \)

This means that \( X \) follows a normal distribution with a mean (\( \mu \)) of 20 days and a standard deviation (\( \sigma \)) of 6 days.

#### Question Part (b)
**Question:** 
If one of the trials is randomly chosen, find the probability that it lasted at least 16 days.

**Answer:** 
Calculate the probability \( P(X \geq 16) \).

Given in the answer box: 0.3334  (Answer is marked incorrect)

#### Question Part (c)
**Question:** 
If one of the trials is randomly chosen, find the probability that it lasted between 21 and 27 days.

**Answer:** 
Calculate the probability \( P(21 \leq X \leq 27) \).

Given in the answer box: 0.2595  (Answer is marked incorrect)

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This problem involves the application of properties of the normal distribution, specifically finding probabilities associated with a given normal distribution using the z-score formula and standard normal distribution tables or software.
Transcribed Image Text:### Duration of Criminal Trials - Normal Distribution Suppose that the duration of a particular type of criminal trial is known to be normally distributed with a mean of 20 days and a standard deviation of 6 days. Let \( X \) be the number of days for a randomly selected trial. Round all answers to 4 decimal places where possible. #### Question Part (a) **Question:** What is the distribution of \( X \)? **Answer:** \( X \sim N \left( \mu = 20, \sigma = 6 \right) \) This means that \( X \) follows a normal distribution with a mean (\( \mu \)) of 20 days and a standard deviation (\( \sigma \)) of 6 days. #### Question Part (b) **Question:** If one of the trials is randomly chosen, find the probability that it lasted at least 16 days. **Answer:** Calculate the probability \( P(X \geq 16) \). Given in the answer box: 0.3334 (Answer is marked incorrect) #### Question Part (c) **Question:** If one of the trials is randomly chosen, find the probability that it lasted between 21 and 27 days. **Answer:** Calculate the probability \( P(21 \leq X \leq 27) \). Given in the answer box: 0.2595 (Answer is marked incorrect) ### Tools for Assistance - **Question Help:** Written Example - **Message Instruction:** Message instructor for further assistance. ### Actions - **Submit Question:** Button available to submit the question. - **Jump to Answer:** Button available to jump to the answer. This problem involves the application of properties of the normal distribution, specifically finding probabilities associated with a given normal distribution using the z-score formula and standard normal distribution tables or software.
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