Below you are given the examination scores of 20 students

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Practice Problems

Below you are given the examination scores of 20 students (data set also provided in accompanying MS Excel file).
52 99 92 86 84
63 72 76 95 88
92 58 65 79 80
90 75 74 56 99

a. Construct a frequency distribution, cumulative frequency distribution, relative frequency distribution, cumulative relative frequency distribution and percent frequency distribution for the data set using a class width of 10.
b. Construct a histogram showing the percent frequency distribution of the examination scores. Comment on the shape of the distribution.

Hint

frequency distribution :
:

Class interval Fi C Fi R Fi C Rfi % F
50-59 3 3 0.15 0.15 15%
60-69 2 5 0.1 0.25 10%
70-79 5 10 0.25 0.5 25%
80-89 4 14 0.2 0.7 20%
90-99 6 20 0.3 1 30%

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