Select the correct answer. What is the length of RS?

Figure not drawn to scale
A.
8
B.
10
C.
16
D.
20

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

Divide. write in the simplest form. 4 1/6 divided by 10

Aproduction manager test 10 toothbrushes and finds that their mean lifetime is 450 hours. she then design sales package of this type of toothbrush. it states that the customers can expect the toothbrush to last approximately 460 hours. this is an example of what phase of inferential statistics