Haryana Police Constable Model Paper 1

© examsiri.com

Question : 50 of 100

Marks: +1, -0

Find the variance of 42, 24, 32, 64, 68?

312.4
300.8
306.6
308.2

Solution:

GIVEN:
Five numbers

42, 24, 32, 64, 68

CONCEPT:
Concept of variance
FORMULA USED:
Mean =

\Sum/\Total

Variance

(\σ^ 2) = ∑\δ^ 2/\n

CALCULATION:
Mean =

(42 + 24 + 32 + 64 + 68)/5 = 230/5 = 46

∑\δ^{2} = |42 - 46|^{2} + |24 - 46|^{2} + |32 - 46|^{2} + |64 - 46|^{2} + |68 - 46|^{2}

⇒

16 + 484 + 196 + 324 + 484=1504

Variance

(\σ^{2}) = ∑\δ2/\n

⇒ 1504/5= 300.8

© examsiri.com

Go to Question:

Prev Question

Next Question