Question

Find the variance and standard deviation.
{10, 12, 14, 15, 18, 20, 23}

Answer 1

Standard deviation is the square root of the variance.

Variance is given by SUM OF (x_i - mean)^2

where x_1 = 10, x_2 = 12, x_3 = 14, etc...

Answer 2

need help?

Answer 3

first find the mean=16

Answer 4

variance=126
standard deviation=4.242640687...

Answer 5

hope that helped amy :]

Answer 6

since you are going to use a calculator anyway, and this is a boring task, you might as well cheat
http://www.wolframalpha.com/input/?i=variance+%7B10%2C+12%2C+14%2C+15%2C+18%2C+20%2C+23%7D

Answer 7

tyvm satellite

Answer 8

wolframalpha ftw, forgot i had that resource

Answer 9

how do i program my graphical calculator to use this function during an exam? :P

Answer 10

that was wrong, tai

Answer 11

your graphing calculator probably has the variance built in. look on line or at the manual for instructions