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UPSC CDS Math Statistics Questions
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© examsnet.com
Question : 1
Total: 63
What is the mean of frequency distribution of Series-I ?
[2019 CDS-II]
33.6
35.6
37.6
39.6
Validate
Solution:
From the given data series-I and series-II have 100 students.
For series-I
20
+
15
+
10
+
x
+
y
=
100
x
+
y
=
55
.
.
.
(
i
)
For series-II
4
+
8
+
4
+
2
x
+
y
=
100
2
x
+
y
=
84.
.
.
(
i
i
)
From equation (i) and (ii),
x
=
29
,
y
=
26
Class interval
Mid-point
Frequency Series-I
m.f
Frequency Series-I
m.f
10-20
15
20
300
4
60
20-30
25
15
375
8
200
30-40
35
10
350
4
140
40-50
45
29
1305
58
2610
50-60
55
26
1430
26
1430
Total
100
3760
100
4440
Now, mean of the series-I
=
∑
m
f
∑
f
=
3760
100
=
37.6
© examsnet.com
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