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JEE Main Math Class 12 Statistics Part 1 Questions
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© examsnet.com
Question : 7
Total: 115
If the variance of the frequency distribution
X
i
2
3
4
5
6
7
8
Frequency
f
i
3
6
16
α
9
5
6
[31-Jan-2023 Shift 1]
Your Answer:
Validate
Solution:
σ
x
2
=
σ
d
2
=
∑
f
i
d
i
2
∑
f
i
−
(
∑
f
i
d
i
∑
f
i
)
2
=
150
45
+
α
−
0
=
3
⇒
150
=
135
+
3
α
⇒
3
α
=
15
⇒
α
=
5
© examsnet.com
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