4. Compute the mean and standard deviation of the random variable with the given discrete probability distribution. P(x) 0.10 -3 0.17 0.36 0.37 013

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**4. Compute the mean and standard deviation of the random variable with the given discrete probability distribution.**

| X  | P(x) |
|----|------|
| -3 | 0.10 |
| 0  | 0.17 |
| 1  | 0.36 |
| 3  | 0.37 |

**5. Out of all registered vehicles in California, 8% of them fail the State Emissions Test. 12 Vehicles are selected at random from the data bank of registered vehicles.**

a) Find the probability that exactly 3 of them fail: \( P(X=3) \)

b) Find the probability that fewer than 3 of them fail the test.

**6. Let Z be a random variable with the standard normal distribution. Find the probability that the random variable Z will take a value greater than 0.36: \( P(Z > 0.36) \)**

**7. Let Z be a random variable with the standard normal distribution. Find the Z-score of the random variable that has a percentile of 25%.**
Transcribed Image Text:**4. Compute the mean and standard deviation of the random variable with the given discrete probability distribution.** | X | P(x) | |----|------| | -3 | 0.10 | | 0 | 0.17 | | 1 | 0.36 | | 3 | 0.37 | **5. Out of all registered vehicles in California, 8% of them fail the State Emissions Test. 12 Vehicles are selected at random from the data bank of registered vehicles.** a) Find the probability that exactly 3 of them fail: \( P(X=3) \) b) Find the probability that fewer than 3 of them fail the test. **6. Let Z be a random variable with the standard normal distribution. Find the probability that the random variable Z will take a value greater than 0.36: \( P(Z > 0.36) \)** **7. Let Z be a random variable with the standard normal distribution. Find the Z-score of the random variable that has a percentile of 25%.**
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