Calculate the variance of 2, 3, 3, 4, 5, 5, 5, 7, 7 and 9
-
A.
2.2 -
B.
3.4 -
D.
4.0 -
D.
4.2
Correct Answer: Option D
Explanation
x = (frac{2 + 3 + 3 + 4 + 5 + 5+ 5+ 7 + 7 + 9}{10})
=(frac{50}{10})
= 5
Variance = (frac{sum{(x – x})^2}{N})
(frac{9 + 4+ 4+ 1 + 4 + 4 + 16}{10})
= (frac{42}{10})
= 4.2