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a) Following are the marks obtained by 20 pupils of a class. Present the marks in frequency table and find the mean marks. 50, 90 70, 80, 50 40, 60, 40, 80, 50, 70, 70, 80 60, 40 70, 50, 70, 60, 70, ​

Sagot :

Benjaminwhesuagboyinidn

Answer:

Represent the mark on frequency table as follows;

Marks Frequency

40 3

50 4

60 3

70 6

80 3

90 1

Mean= Sum of all the marks

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Frequency

(40×3)+(50×4)+(60×3)+(70×6)+(80×3)+(90×1)

------------------------------------------------------------

20

=2250

--------

20

=11.5

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