Exam-style questions9 P1:The grouped frequency table belowshows the results of a statistics testtaken by 70 students.Test result x% FrequencyOsx< 208.20 sx< 401740 sx< 602560 sx< 801380 sx< 1007a State the modal class for the data.(1 mark)b Find an estimate for the mean.(3 marks)C Find an estimate for the standarddeviation.(2 marks)d A similar class took the same test.Their mean mark was 45% and thestandard deviation was 19.5.Compare the marks of the twoclasses, stating your conclusions(2 marks)

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Answered: Exam-style questions 9 P1: The grouped…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The full question didn't fit in one part so I attached 2 photos.
The mean # of hours worked
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The numbers of courses taught per semester by a random sample of university professors are shown in the histogram. Make a frequency distribution for the data. Then use the table to estimate the sample mean and the sample standard deviation of the data set. Make a frequency distribution for the data. X 1 3 f Number of professors 25- 20- 15- 10- 4 20 23 15 1 2 3 4 Number of courses taught per semester

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Exam-style questions 9 P1: The grouped frequency table below shows the results of a statistics test taken by 70 students. Test result x% Frequency 0≤x<20 8 20 ≤ x < 40 17 40 ≤X < 60 25 60 ≤ x < 80 13 80