3) Suppose test scores are measured by the Gaussian Normal Distribution N(X,75,10) calculate the following. a) Pr(80 < X < 90) b) Pr(50 < X< 70) c) The 95 th percentile

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### Normal Distribution in Test Scores

**Problem Statement:**

Suppose test scores are measured by the Gaussian Normal Distribution \( N(X, 75, 10) \). Calculate the following:

#### Tasks:

**a)** \(Pr(80 < X < 90)\)

**b)** \(Pr(50 < X < 70)\)

**c)** The 95th percentile

---

In this problem, the Gaussian Normal Distribution has a mean (\(\mu\)) of 75 and a standard deviation (\(\sigma\)) of 10. The tasks involve calculating probabilities and the percentile for given test scores.

To solve these problems, we'll need to convert raw scores (X) to Z-scores and then use Z-tables or statistical software to find the required probabilities and percentiles.
Transcribed Image Text:### Normal Distribution in Test Scores **Problem Statement:** Suppose test scores are measured by the Gaussian Normal Distribution \( N(X, 75, 10) \). Calculate the following: #### Tasks: **a)** \(Pr(80 < X < 90)\) **b)** \(Pr(50 < X < 70)\) **c)** The 95th percentile --- In this problem, the Gaussian Normal Distribution has a mean (\(\mu\)) of 75 and a standard deviation (\(\sigma\)) of 10. The tasks involve calculating probabilities and the percentile for given test scores. To solve these problems, we'll need to convert raw scores (X) to Z-scores and then use Z-tables or statistical software to find the required probabilities and percentiles.
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