Astore manager is looking at past jewelry sales to determine what sizes of rings to keep in stock. the list shows the ring sizes purchased by the last ten jewelry customers. 9, 7, 6.5, 7.5, 7, 8, 5, 6, 7.5, 8 what is the variance of the data set? round to the nearest hundredths.

Step-by-step explanation:

The variance is defined by

Where is the mean and is the total number of rings.

First, we find the mean

Then, we subtract the means with each element

Now, we elevate each difference to the square power

Then, we sum all these results

Now, we replace in the formula

Therefore, the variance of the data set is 1.28, approximately.

b

step-by-step explanation:

the solution is x=1

step-by-step explanation:

we are given our   equation as

let's assume

left side function is

right side function is

now, we can draw graph

and then we can get intersection point

the intersection point will be solution

so, the solution is

x=1