To find the median class, we first need to calculate the cumulative frequency of each class.
Age in years
10 - 14
15 - 19
20 - 24
25 - 29
30 - 34
Frequency
6
8
14
10
12
Cumulative Frequency
6
14
28
38
50
The median class is the class where the cumulative frequency is equal to or just greater than half of the total frequency. Here, the total frequency is 50, so the median class will be the third class, 20-24 years old, with a cumulative frequency of 28. To find the class mark of the median class, we need to use the formula: Class mark = Lower limit + Upper limit / 2 The lower limit of the median class is 20 and the upper limit is 24. Therefore, the class mark of the median class is: Class mark = (20 + 24) / 2 = 22 So, the answer is 22.