Which describes the standard deviation?

a. a form of measurement of the average difference between sample values and the sample mean
b. the confidence level that a sample mean accurately represents a population mean
c. the value for which half of the sample elements are no bigger, and half are no smaller
d. the interval around the sample mean that you expect to contain the population mean

The correct option is:

Option: A

A. a form of measurement of the average difference between sample values and the sample mean

Step-by-step explanation:

We know that:

The Standard Deviation is a measure of how spread out numbers are.

It is represented by the symbol sigma 'σ '

It is calculated as:

Hence, the correct option is:

Option: A.

in the attachment.   i didn't see your choices.   the word which means there is choices.

step-by-step explanation:

(x,y)

x tells you how much left or right you go from the origin

y tells you how much down or up you go from the origin

so for example (-3,2), you go left 3 and up twice. i denoted which of the ordered pairs is which in my graph.