standard deviation of the exam scores

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
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Scores on an exam (out of 100 points) given in a university statistics course are displayed in the provided histogram 

  1. Describes the shape of the distribution of exam scores
  2. If a score of 15 is added to the data, the mean will be bigger or smaller than the median?
  3. Based on the histogram, what is likely the standard deviation of the exam scores?
16
14-
12-
10
8.
6.
4
72
76
80
84
88
92
Exam Scores
Frequency
Transcribed Image Text:16 14- 12- 10 8. 6. 4 72 76 80 84 88 92 Exam Scores Frequency
Expert Solution
Step 1

Histogram: The frequency distribution shows how the data is distributed.

1)From the Graph, we Observe that the Distribution is symmetric around a mean of 82

therefore it indicates that mean=mode =median=82

2)  If a score of 15 is added then the mean is greater than the median 

because we know the relation if Distribution is Positively skewed then mean>median>mode

therefore here Mean>Median

3) we have to find a standard deviation from histogram for values 72,74,76,78,80,82,84,86,88,90,92

 

 

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