Question

Find the variance and standard deviation of the following data by means deviation method. 600, 470, 170, 430, 300

Answer 1

Answer:

X

600+470+170+430+300=1970

_

x or x of bar = 1970/5 =394

dx = x - x of bar

206+76-224+36-94 =0

${dx}^{2} = 42436 + 5776 + 50176 + 1296 + 8836 = 108520$

$standard \: deviation \: = \: \sqrt{108520 \div 5}$

$= \: \sqrt{21704 }$

=147.322