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Variance and Standard deviation

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3 weeks ago

Variance and Standard deviation Class 11th

The variance of 20 observations is 5. If each observation is multiplied by 2 then the new variance of the resulting observations, is:
0 Follower 2 Views

V
Vishal Baghel

Contributor-Level 10

(Var)new = k² (Var)old
= 4 * 5 = 20

New answer posted

a month ago

Variance and Standard deviation Class 11th

Let xᵢ (1 ≤ i ≤ 10) be ten observations of a random variable x. If Σ(from i=1 to 10)(xᵢ – p) = 3 and Σ(from i=1 to 10)(xᵢ – p)² = 9 where 0 ≠ p ∈ R, then the standard deviation of these observations is:
0 Follower 3 Views

A
alok kumar singh

Contributor-Level 10

S.D. = √ (∑? ¹? (x? -p)²/10) - (∑? ¹? (x? -p)/10)²
√9/10 - (3/10)² = √9/10 - 9/100

New answer posted

a month ago

Variance and Standard deviation Class 11th

If the variance of the terms in an increasing A.P. b?,b?,b?,.,b? is 90, then the common difference of this A.P. is 
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R
Raj Pandey

Contributor-Level 9

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