50-60
1
Q3 CASE STUDY 3 (Attempt any four) (1x4=4)
The marks of students obtained in MATHEMATICS are given below
Marks
10-20 20-30 B0-40 40-50
No. of students 2
17
6
Find the mean score of students
(a) 53
(b) 63
(c) 35
(d) 37
What is the sum of lower limit of modal class and upper limit of median
class?
(a) 10
(b) 40
(0) 60
(d) 70
What is the empirical relationship among mean median and mode?
(a) 3 median = mode + 2 mean
(b) Bmean - 2mode =median
(a mode +2mean median
(d) 2 medians = mode +3mean
How many students score less than 40 marks?
(a) 6
(by
( 4
(d)13
If median of the data 24,25,26, +2, + 3B0B1 34 is 27.5 then x is
(a) 27
GH
X2
Answers
Answered by
1
Answer:
Class Interval frequency (fi) Mid value fixi
0-10 12 5 60
10-20 16 15 240
20-30 6 25 150
30-40 7 35 245
40-50 9 45 405
N=∑fi=50 ∑fixi=1100
∴Mean=
∑fi
∑fixi
=
50
1100
=22
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