If the variance of the data values in a sample is 144, what is the standard deviation of the data values?

12

Step-by-step explanation:

We are given that the variance of the data values in a sample = 144

Since we know that the value of variance is the square of standard deviation.

Therefore, to find the value of standard deviation by using variance, we need to find the square root of the variance.

i.e.

answer: it's d

step-by-step explanation:

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.