Question

34. The following table shows the cumulative frequency distribution of marks of 34 students
in a test:
Marks (out of 90)
Number of students
More that or equal to 80
More that or equal to 70
More that or equal to 60
More that or equal to 50
More that or equal to 40
More that or equal to 30
More that or equal to 20
More that or equal to 10
More that or equal to 0
Construct a frequency distribution table for the data above.
Also, find the mean of the data.​

Answer 1

Answer:

May be this is helpfull for you

Step-by-step explanation:

Answer 2

Mean = 49.1

Step-by-step explanation:

Class    Class Mean       frequency          Class mean * frequency

0 - 10              5                          2                             10

10 - 20           15                          2                            30

20 - 30          25                         3                             75

30 - 40           35                         4                           140

40 - 50           45                         6                           270

50 - 60           55                         6                           330

60 - 70           65                         5                           325

70 - 80           75                         2                            150

80 - 90           85                         4                           340

                      Total                    34                          1670

Mean = 1670/34

= 49.1

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