The number of ounces of water a person drinks per day is normally distributed with a standard deviation of 15 ounces. If Sean drinks 88 ounces per day with a z- score of 1.6, what is the mean ounces of water a day that a person drinks? Submit

Algebra and Trigonometry (6th Edition)
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ISBN:9780134463216
Author:Robert F. Blitzer
Publisher:Robert F. Blitzer
ChapterP: Prerequisites: Fundamental Concepts Of Algebra
Section: Chapter Questions
Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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### Probability and Statistics Review

#### Instructor: Jane Jackson

**Problem:**
The number of ounces of water a person drinks per day is normally distributed with a standard deviation of 15 ounces. If Sean drinks 88 ounces per day with a z-score of 1.6, what is the mean ounces of water a day that a person drinks?

_Answer:_ _______

**Explanation:**
To solve this problem, use the z-score formula:

\[ z = \frac{(X - \mu)}{\sigma} \]

Where:
- \( z \) is the z-score
- \( X \) is the value in question (88 ounces)
- \( \mu \) is the mean
- \( \sigma \) is the standard deviation (15 ounces)

Rearrange the formula to solve for the mean (\( \mu \)):

\[ \mu = X - z\sigma \]

Substitute in the known values:

\[ \mu = 88 - (1.6 \times 15) \]

\[ \mu = 88 - 24 \]

\[ \mu = 64 \]

So, the mean ounces of water a person drinks per day is 64 ounces.
Transcribed Image Text:### Probability and Statistics Review #### Instructor: Jane Jackson **Problem:** The number of ounces of water a person drinks per day is normally distributed with a standard deviation of 15 ounces. If Sean drinks 88 ounces per day with a z-score of 1.6, what is the mean ounces of water a day that a person drinks? _Answer:_ _______ **Explanation:** To solve this problem, use the z-score formula: \[ z = \frac{(X - \mu)}{\sigma} \] Where: - \( z \) is the z-score - \( X \) is the value in question (88 ounces) - \( \mu \) is the mean - \( \sigma \) is the standard deviation (15 ounces) Rearrange the formula to solve for the mean (\( \mu \)): \[ \mu = X - z\sigma \] Substitute in the known values: \[ \mu = 88 - (1.6 \times 15) \] \[ \mu = 88 - 24 \] \[ \mu = 64 \] So, the mean ounces of water a person drinks per day is 64 ounces.
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