Correct option is D
Solution:
Identify the Modal Class
Modal class = class with highest frequency
Frequencies: 13, 15, 9, 10, 8, 5
Highest frequency = 15 => Modal class = 145–150
Upper limit of modal class = 150
Identify the Median Class
Total number of students =
13+15+9+10+8+5=60
13+15+9+10+8+5=60
Median lies at the
Compute cumulative frequency:
- Up to 140–145: 13
- Up to 145–150: 13 + 15 = 28
- Up to 150–155: 28 + 9 = 37
30th item lies in class 150–155
Lower limit of median class = 150
Add required limits
Upper limit of modal class = 150
Lower limit of median class = 150
Sum = 150 + 150 = 300
Correct answer is (d) 300
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