Given data 60, 60, 44, 58, 68, α, β, 56 has mean 58, variance = 66.2 then find α2 + β2
Given data 60, 60, 44, 58, 68, α, β, 56 has mean 58, variance = 66.2 then find α2 + β2
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1 Answer
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Variance =
α2 + β2 = 897.7 × 8
= 7181.6
Similar Questions for you
xi | fi | c.f. |
0 – 4 4 – 8 8 – 12 12 – 16 16 – 20 | 2 4 7 8 6 | 2 6 13 21 27 |
So, we have median lies in the class 12 – 16
I1 = 12, f = 8, h = 4, c.f. = 13
So, here we apply formula
20 M = 20 × 12.25
= 245
212 + a + b = 330
⇒ a + b = 118
= 3219
11760 + a2 + b2 = 19314
⇒ a2 + b2 = 19314 – 11760
= 7554
(a + b)2 –2ab = 7554
From here b = 41.795
a + b = 118
⇒ a + b + 2b = 118 + 83.59
= 201.59
Kindly go throuigh the solution
Given
&
(i) & (ii)
Now variance = 1 given
->(a - b) (a - b + 4) = 0
Since
Variance =
Let 2a2 – a + 1 = 5x
D = 1 – 4 (2) (1 – 5n)
= 40n – 7, which is not
As each square form is
Variance of 2001, 2003, 2006, 2007, 2009, 2010 is same as variance of 1, 3, 6, 7, 9, 10
mean =
var (x) =
var (x) = 10
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