The grouped frequency table below shows the results of a statistics test taken by 70 students. Test result x% Frequency Osx< 20 8. 20 sx< 40 17 40 sx< 60 25 60

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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The grouped frequency table below
shows the results of a statistics test
taken by 70 students.
Test result x%
Frequency
0sx< 20
8.
20 <x< 40
17
40 sx< 60
25
60 <x< 80
13
80 sx< 100
1)
What is the mean?
2)
Explain how to get the median when you have a frequency table, then find the median.
3)
What is the modal group?
4)
How are you going to estimate standard deviation?
5)
A similar class took the same test. Their mean was 45 %, and Sx was 19.5. Compare the two classes.
Transcribed Image Text:The grouped frequency table below shows the results of a statistics test taken by 70 students. Test result x% Frequency 0sx< 20 8. 20 <x< 40 17 40 sx< 60 25 60 <x< 80 13 80 sx< 100 1) What is the mean? 2) Explain how to get the median when you have a frequency table, then find the median. 3) What is the modal group? 4) How are you going to estimate standard deviation? 5) A similar class took the same test. Their mean was 45 %, and Sx was 19.5. Compare the two classes.
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