On a planet far far away from Earth, IQ of the ruling species is normally distributed with a mean of 102 and a standard deviation of 18. Suppose one individual is randomly chosen. Let X = IQ of an individual. a. What is the distribution of X? X - N( b. Find the probability that a randomly selected person's IQ is over 84. Round your answer to 4 decimal places. c. A school offers special services for all children in the bottom 6% for IQ scores. What is the highest IQ score a child can have and still receive special services? Round your answer to 2 decimal places. d. Find the Inter Quartile Range (IQR) for IQ scores. Round your answers to 2 decimal places. Q1: Q3: IQR:

MATLAB: An Introduction with Applications
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### Probability and Statistics Practice Problem

On a planet far far away from Earth, the IQ of the ruling species is normally distributed with a mean of 102 and a standard deviation of 18. Suppose one individual is randomly chosen. Let \( X \) = IQ of an individual.

#### Questions:

a. **What is the distribution of \( X \)?**  
   \( X \sim N(\mu, \sigma^2) \)  
   \( X \sim N( \_\_\_\_ , \_\_\_\_ ) \)  

b. **Find the probability that a randomly selected person's IQ is over 84.**  
   \(\_\_\_\_\_)  
   *Round your answer to 4 decimal places.*

c. **A school offers special services for all children in the bottom 6% for IQ scores. What is the highest IQ score a child can have and still receive special services?**  
   \(\_\_\_\_\_)  
   *Round your answer to 2 decimal places.*

d. **Find the Interquartile Range (IQR) for IQ scores.**  
   *Round your answers to 2 decimal places.*

   - **Q1:** \(\_\_\_\_\_)
   - **Q3:** \(\_\_\_\_\_)
   - **IQR:** \(\_\_\_\_\_)

#### Hint:

##### Helpful videos:
- [Find a Probability \[+\]](#)
- [Finding a Value Given a Probability \[+\]](#)
- [Hint \[+\]](#)

---

In case calculations are needed for any of the questions above, make sure to reference appropriate statistical techniques and tables (e.g., Z-tables for standard normal distribution, quartile calculations, etc.).
Transcribed Image Text:### Probability and Statistics Practice Problem On a planet far far away from Earth, the IQ of the ruling species is normally distributed with a mean of 102 and a standard deviation of 18. Suppose one individual is randomly chosen. Let \( X \) = IQ of an individual. #### Questions: a. **What is the distribution of \( X \)?** \( X \sim N(\mu, \sigma^2) \) \( X \sim N( \_\_\_\_ , \_\_\_\_ ) \) b. **Find the probability that a randomly selected person's IQ is over 84.** \(\_\_\_\_\_) *Round your answer to 4 decimal places.* c. **A school offers special services for all children in the bottom 6% for IQ scores. What is the highest IQ score a child can have and still receive special services?** \(\_\_\_\_\_) *Round your answer to 2 decimal places.* d. **Find the Interquartile Range (IQR) for IQ scores.** *Round your answers to 2 decimal places.* - **Q1:** \(\_\_\_\_\_) - **Q3:** \(\_\_\_\_\_) - **IQR:** \(\_\_\_\_\_) #### Hint: ##### Helpful videos: - [Find a Probability \[+\]](#) - [Finding a Value Given a Probability \[+\]](#) - [Hint \[+\]](#) --- In case calculations are needed for any of the questions above, make sure to reference appropriate statistical techniques and tables (e.g., Z-tables for standard normal distribution, quartile calculations, etc.).
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