Suppose that a random variable Z has a standard normal distribution. Find a such that P(Z > a) = 0.229. Give your answer to two decimal places. You may find this Z-table useful. a = -2.00 Incorrect

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Title: Solving for a Z-Value in a Standard Normal Distribution

**Problem Statement:**

Suppose that a random variable \( Z \) has a standard normal distribution. Find \( a \) such that \( P(Z > a) = 0.229 \). Give your answer to two decimal places. You may find this Z-table useful.

**Input Box:**

\( a = \) [Input Field]

(Current Answer: \(-2.00\), marked as Incorrect)

---

To solve this problem, you need to use the Z-table to find the value of \( a \) that corresponds to a right-tail probability of 0.229 in a standard normal distribution. The Z-table provides the cumulative probabilities for different Z-scores, which can help identify the correct value for \( a \).

Steps to solve:
1. Look up the cumulative probability on the Z-table that equals \( 1 - 0.229 = 0.771 \).
2. Find the corresponding Z-score for this cumulative probability.
3. Input the correct Z-score rounded to two decimal places. 

This exercise helps in understanding the application of the standard normal distribution in calculating probabilities and finding specific percentiles.
Transcribed Image Text:Title: Solving for a Z-Value in a Standard Normal Distribution **Problem Statement:** Suppose that a random variable \( Z \) has a standard normal distribution. Find \( a \) such that \( P(Z > a) = 0.229 \). Give your answer to two decimal places. You may find this Z-table useful. **Input Box:** \( a = \) [Input Field] (Current Answer: \(-2.00\), marked as Incorrect) --- To solve this problem, you need to use the Z-table to find the value of \( a \) that corresponds to a right-tail probability of 0.229 in a standard normal distribution. The Z-table provides the cumulative probabilities for different Z-scores, which can help identify the correct value for \( a \). Steps to solve: 1. Look up the cumulative probability on the Z-table that equals \( 1 - 0.229 = 0.771 \). 2. Find the corresponding Z-score for this cumulative probability. 3. Input the correct Z-score rounded to two decimal places. This exercise helps in understanding the application of the standard normal distribution in calculating probabilities and finding specific percentiles.
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