The random-number generator on calculators randomly generates a number between 0 and 1. The random variable X, the number generated, follows a uniform probability distribution. (a) Identify the graph of the uniform density function. (b) What is the probability of generating a number between 0.63 and 0.76? (c) What is the probability of generating a number greater than 0.83? ..... (a) Choose the correct graph of the uniform density function below.

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### Random-Number Generator and Uniform Probability Distribution

The random-number generator on calculators randomly generates a number between 0 and 1. The random variable \(X\), the number generated, follows a uniform probability distribution.

#### Tasks

**(a)** Identify the graph of the uniform density function.

**(b)** Calculate the probability of generating a number between 0.63 and 0.76.

**(c)** Calculate the probability of generating a number greater than 0.83.

#### Explanation of Graphs

There are three graphs labeled A, B, and C, showing potential uniform density functions:

- **Graph A**: Displays a constant density of 1 for \(x\) values between 0 and 1, and 0 elsewhere.
- **Graph B**: Shows a density function with a constant value of 0.8, which is incorrect for a uniform distribution from 0 to 1.
- **Graph C**: Displays a density function constant at 0.5, which is incorrect for the described distribution.

**Selecting the Correct Graph:**

For a uniform distribution between 0 and 1, the graph should have a constant density of 1 over this range, making **Graph A** the correct choice.

#### Probability Calculations

**(b)** Calculate the probability of generating a number between 0.63 and 0.76.

- Probability = (0.76 - 0.63) = 0.13

**(c)** Calculate the probability of generating a number greater than 0.83.

- Probability = (1 - 0.83) = 0.17

These calculations are based on the properties of a uniform distribution, where the probability is equivalent to the length of the interval within the given range [0, 1].
Transcribed Image Text:### Random-Number Generator and Uniform Probability Distribution The random-number generator on calculators randomly generates a number between 0 and 1. The random variable \(X\), the number generated, follows a uniform probability distribution. #### Tasks **(a)** Identify the graph of the uniform density function. **(b)** Calculate the probability of generating a number between 0.63 and 0.76. **(c)** Calculate the probability of generating a number greater than 0.83. #### Explanation of Graphs There are three graphs labeled A, B, and C, showing potential uniform density functions: - **Graph A**: Displays a constant density of 1 for \(x\) values between 0 and 1, and 0 elsewhere. - **Graph B**: Shows a density function with a constant value of 0.8, which is incorrect for a uniform distribution from 0 to 1. - **Graph C**: Displays a density function constant at 0.5, which is incorrect for the described distribution. **Selecting the Correct Graph:** For a uniform distribution between 0 and 1, the graph should have a constant density of 1 over this range, making **Graph A** the correct choice. #### Probability Calculations **(b)** Calculate the probability of generating a number between 0.63 and 0.76. - Probability = (0.76 - 0.63) = 0.13 **(c)** Calculate the probability of generating a number greater than 0.83. - Probability = (1 - 0.83) = 0.17 These calculations are based on the properties of a uniform distribution, where the probability is equivalent to the length of the interval within the given range [0, 1].
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