1) The test averages for 40 students are listed below. Use 8 classes (NOT BINS) to construct a frequency distribution table. The first column will be the classes, second will be the frequencies, third are the relative frequencies, forth the class midpoints, and last are the cumulative frequencies. From the table draw a histogram, a polygon, and an ogive (a cumulative frequency graph).
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11
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11
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16
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16
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17
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18
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18
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19
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19
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19
|
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20
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20
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21
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22
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22
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22
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23
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24
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24
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25
|
|
28
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29
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29
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30
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30
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30
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31
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31
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32
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32
|
|
32
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33
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34
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35
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36
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36
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40
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40
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40
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40
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2) Find the mean, median, mode, variance and standard deviation for the following nine data values.
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81
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82
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83
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84
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86
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88
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88
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89
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91
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3) Find the four quartiles and the 20th and 80th percentiles for the above data.