Question

Work Sheet -
The marks obtained by 50 students in a mathematics ex excamination are as follows. Prepare the Grouped frequency disturibution of the data with inclusive classes taking class -size as s.

68 84 75 82 68 90 62 88 76 93 73 79 88 73 60 98 71 60 85 75 61 65 75 87 74 62 95 78 63 72 66 78 82 75 94 77 69 74 68 60 76 78 89 61 75 95 60 7983 71 ​

Answer 1

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SOLUTION:

i) as per the table students obtained marks equal to 7 or more than equal to 7 are 5+4+3=12

hence, 12 students obtained marks equal to or more than equal to 7.

ii) as per the table students obtained marks below 4 are 2+3+3=8

hence, 8 students have obtained marks below 4.

Answer 2

Answer:

Total number of values =50

Range = Highest value − Lowest value

=98−8=90

Let us divide the given data into 10 classes.

∴ Length of the Class interval =

Number of class interval

Range

=

10

90

=10

The frequency table of the marks obtained by 50 students in a mathematics test is as follows.