Problems of Statistics - Desklib

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Problems of Statistics

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ANSWER 1A
Table 1: Frequency Distribution of Scores of Students
Class Interval Lower Bound Upper Bound
Mid-
Point Frequency
50-60 50 59 54.5 3
60-70 60 69 64.5 2
70-80 70 79 74.5 5
80-90 80 89 84.5 4
90-100 90 99 94.5 6
Table 2: Cumulative Frequency Distribution of Scores of Students
Class Interval Lower Bound Upper Bound
Mid-
Point Frequency
50-60 50 59 54.5 3
60-70 60 69 64.5 5
70-80 70 79 74.5 10
80-90 80 89 84.5 14
90-100 90 99 94.5 20
Table 3: Relative Frequency Distribution of Scores of Students
Class Interval Lower Bound Upper Bound
Mid-
Point Frequency
50-60 50 59 54.5 3
60-70 60 69 64.5 2
70-80 70 79 74.5 5
80-90 80 89 84.5 4
90-100 90 99 94.5 6
Table 4: Cumulative Relative Frequency Distribution of Scores of Students
Class Interval Lower Bound Upper Bound
Mid-
Point Frequency
50-60 50 59 54.5 0.15
60-70 60 69 64.5 0.25
70-80 70 79 74.5 0.50
80-90 80 89 84.5 0.70
90-100 90 99 94.5 1.00

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Table 5: Percent Frequency Distribution of Scores of Students
Class Interval Lower Bound Upper Bound
Mid-
Point Frequency
50-60 50 59 54.5 15.00%
60-70 60 69 64.5 10.00%
70-80 70 79 74.5 25.00%
80-90 80 89 84.5 20.00%
90-100 90 99 94.5 30.00%
ANSWER 1B
Figure 1: Distribution of Scores of the Students
The histogram shows that the distribution of scores of the students is left skewed in nature. The
conclusion may be drawn that examination scores of majority of the students are highly
satisfactory (Hinton, 2014).