For the data:
Marks obtained Below 10 Below 20 Below 30 Below 40 Below 50
No. of students 5
16
28
42
72
If x is the class mark of the modal class and y is the upper limit of the median class, then the value of (2x + y) is
Answers
Given : x is the class mark of modal class y is the upper limit of the median class
To Find : value of (2x + y)
Solution:
f cf
0-10 5 5
10-20 11 16
20-30 12 28
30-40 14 42
40-50 30 72
Modal Class is 40-50 as max frequency 14
class mark of Modal Class x = 45
Median Class is 30-40 as 72/ 2 = 36 ( 28 < 36 ≤ 42 )
upper limit y = 40
2x + y = 2*45 + 40 = 130
2x + y = 130
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