Question

What is the standard deviation of the following data set?
11, 13, 15, 16, 20, 21
A) √15.2
B) √18
C) √76
D) √3.6

Answer 1

c

Answer 2

standard deviation is
\[\sigma=\sqrt{1/n(\sum_{1}^{n}(x-x^{-})^2}\]
where xbar is mean
mean is=(11+13+15+16)20+21)6=16
ans standard deviation using above formula is
=3.55

Answer 3

d