Omar recorded the number of hours he worked each week for a year. Below is a random sample that he took from his data.

13, 17, 9, 21

What is the standard deviation for the data?

Standard deviation: s = StartRoot StartFraction (x 1 minus x overbar) squared + (x 2 minus x overbar) squared + ellipsis + (x n minus x overbar) squared Over n minus 1 EndFraction EndRoot.

A.) 0
B.) 4
C) 2
D.) 26.7

mia khalifa

step-by-step explanation:

answer: b

step-by-step explanation:

step-by-step explanation:

we have

using a graphing tool

see the attached figure

this is a quadratic equation (vertical parabola) open up

the vertex is a > vertex

the domain of the function is all real > interval (-∞,∞)

the range of the function is the > [-6.125,∞)

the function has two x->   and

the function is increasing over the > (0.25,∞)

the function is decreasing over the > (-∞,0.25)