In a mid-size company, the distribution of the number of phone calls answered each day by each of the 12 receptionists is bell-shaped and has a mean of 38 and a standard deviation of 3. Using the empirical rule, what is the approximate percentage of daily phone calls numbering between 29 and 47? Do not enter the percent symbol. ans %3D

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Topic Video
Question
6)
### Problem Statement

In a mid-size company, the distribution of the number of phone calls answered each day by each of the 12 receptionists is bell-shaped and has a mean of 38 and a standard deviation of 3. Using the empirical rule, what is the approximate percentage of daily phone calls numbering between 29 and 47?

#### Input Section
- Do not enter the percent symbol.
  - **ans =** [Text box for answer in percentage]

[Submit Question Button]

### Explanation of Empirical Rule and Solution

The empirical rule (also known as the 68-95-99.7 rule) is used in statistics to determine the percentage of values that lie within a certain number of standard deviations from the mean in a normal distribution:

1. **68% of values** fall within **1 standard deviation** of the mean.
2. **95% of values** fall within **2 standard deviations** of the mean.
3. **99.7% of values** fall within **3 standard deviations** of the mean.

#### Steps to Solve:

1. **Identify Mean and Standard Deviation**:
   - Mean (μ): 38
   - Standard Deviation (σ): 3

2. **Determine the Range Boundaries**:
   - Lower boundary = 29
   - Upper boundary = 47

3. **Calculate the Number of Standard Deviations**:
   - From the mean to 29: (38 - 29) / 3 ≈ 3 standard deviations
   - From the mean to 47: (47 - 38) / 3 ≈ 3 standard deviations

4. **Apply the Empirical Rule**:
   - Since both boundaries are within ±3 standard deviations (µ ± 3σ), nearly all (99.7%) of the data points fall within this range.

Therefore, the approximate percentage of daily phone calls numbering between 29 and 47 is **99.7%**.

### Additional Graphical Representation

**The graph would display:**

- A bell curve centered at 38 (mean).
- Vertical lines at 29 and 47, indicating where these values lie on the X-axis.
- Shaded area under the curve between 29 and 47, representing the percentage.

#### Visualization Components:
- **Bell Curve**: Symmetrical and centered at the mean (38).
- **Standard Deviations (σ)**: Horizontal segments marking intervals
Transcribed Image Text:### Problem Statement In a mid-size company, the distribution of the number of phone calls answered each day by each of the 12 receptionists is bell-shaped and has a mean of 38 and a standard deviation of 3. Using the empirical rule, what is the approximate percentage of daily phone calls numbering between 29 and 47? #### Input Section - Do not enter the percent symbol. - **ans =** [Text box for answer in percentage] [Submit Question Button] ### Explanation of Empirical Rule and Solution The empirical rule (also known as the 68-95-99.7 rule) is used in statistics to determine the percentage of values that lie within a certain number of standard deviations from the mean in a normal distribution: 1. **68% of values** fall within **1 standard deviation** of the mean. 2. **95% of values** fall within **2 standard deviations** of the mean. 3. **99.7% of values** fall within **3 standard deviations** of the mean. #### Steps to Solve: 1. **Identify Mean and Standard Deviation**: - Mean (μ): 38 - Standard Deviation (σ): 3 2. **Determine the Range Boundaries**: - Lower boundary = 29 - Upper boundary = 47 3. **Calculate the Number of Standard Deviations**: - From the mean to 29: (38 - 29) / 3 ≈ 3 standard deviations - From the mean to 47: (47 - 38) / 3 ≈ 3 standard deviations 4. **Apply the Empirical Rule**: - Since both boundaries are within ±3 standard deviations (µ ± 3σ), nearly all (99.7%) of the data points fall within this range. Therefore, the approximate percentage of daily phone calls numbering between 29 and 47 is **99.7%**. ### Additional Graphical Representation **The graph would display:** - A bell curve centered at 38 (mean). - Vertical lines at 29 and 47, indicating where these values lie on the X-axis. - Shaded area under the curve between 29 and 47, representing the percentage. #### Visualization Components: - **Bell Curve**: Symmetrical and centered at the mean (38). - **Standard Deviations (σ)**: Horizontal segments marking intervals
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 2 steps with 2 images

Blurred answer
Knowledge Booster
Discrete Probability Distributions
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, statistics and related others by exploring similar questions and additional content below.
Recommended textbooks for you
MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
Statistics
ISBN:
9781119256830
Author:
Amos Gilat
Publisher:
John Wiley & Sons Inc
Probability and Statistics for Engineering and th…
Probability and Statistics for Engineering and th…
Statistics
ISBN:
9781305251809
Author:
Jay L. Devore
Publisher:
Cengage Learning
Statistics for The Behavioral Sciences (MindTap C…
Statistics for The Behavioral Sciences (MindTap C…
Statistics
ISBN:
9781305504912
Author:
Frederick J Gravetter, Larry B. Wallnau
Publisher:
Cengage Learning
Elementary Statistics: Picturing the World (7th E…
Elementary Statistics: Picturing the World (7th E…
Statistics
ISBN:
9780134683416
Author:
Ron Larson, Betsy Farber
Publisher:
PEARSON
The Basic Practice of Statistics
The Basic Practice of Statistics
Statistics
ISBN:
9781319042578
Author:
David S. Moore, William I. Notz, Michael A. Fligner
Publisher:
W. H. Freeman
Introduction to the Practice of Statistics
Introduction to the Practice of Statistics
Statistics
ISBN:
9781319013387
Author:
David S. Moore, George P. McCabe, Bruce A. Craig
Publisher:
W. H. Freeman