Q8 of 69 Page 7

A survey regarding the heights (in cm) of 51 girls of Class X of a school was conducted, and the following data was obtained:


Find the median height.


We have n = 51


So,


The cumulative Frequency just greater than is 29 then the median class is 145-150 such that


the lower limit (l) = 145


cumulative frequency of the class preceding 145-150 (cf) = 11


frequency of the median class 145-150 = 18,


class size (h) = 5


Using the formula,, we have



= 145 + 4.027


= 149.03


So, the median height of the girls is 149.03cm


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