Question

56+11+9+9+6=91/5=18.2 how do I find the standard deviation?

Answer 1

we have the following data 56,11,9,9,6

you have already solved for the average or mean value of data

mean = (56+11+9+9+6)/5 = 91/5 = 18.2

So, we have

we know that the formula for the standard deviation is given as

where xi are given values, i.e. 56,11,9,9,6 and x(bar) =mean = 18.2 and n is the sample size = 5

setting the given values, we get

this gives us

So, the sample standard deviation is 21.21 (rounded to two decimal places)