Q8 of 40 Page 154

Find the mean for the following distribution:

12,14,10,12,15,12,18,10,15,11,19,20,12,15,19,10,18,16,20,17.








⇒ Mean = 14.75


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Draw a histogram for the following frequency distribution.

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Draw a histogram for the following frequency distribution.

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The marks obtained by 12 students in a mathematics examination are given below.

48,78,93,90,66,54,83,58,60,75,89,84.


Find (i) the mean of the marks (ii) the mean mark of the students if each student is given 4 grace marks.

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If the mean of 8,12,21,42, x is 20, find the value of x.