We have n = 100
So, n/2 = 100/2 = 50
The cumulative Frequency just greater than n/2 is 78 then the median class is 35 – 40 such that
the lower limit (l) = 35
cumulative frequency of the class preceding 35 – 40 (cf) = 45
frequency of the median class 35 – 40 = 33,
class size (h) = 5
Using the formula,
= 35 + 0.757
= 35.76
So, the median age of the policy holders is 35.76 years.