Find the standard deviation. round to the nearest tenth. 1, 2, 11, 8, 16, 16,20, 16, 18 oa. 6.5 o b. 6.9 o c. 1.5 ? d. 7.4

A. 6.5

Step-by-step explanation:

First we find the average   of the 9 data:

Where n is the data number, that in this case is 9.

The formula of the standard deviation is:

We replace the data and find the value of the standard deviation:

We approximate the number and the solution is 6,5

a negative exponent is translated as follows:

so, we have

c

step-by-step explanation:

i think because what else can be a sample of every member