Estimating the standard deviation or variance

0.9

***

2.4

2.5

***

3.1

***

4.0

4.3

4.3

4.4

4.4

***

4.9

4.9

5.1

5.2

***

5.6

5.8

Consider the sample of n =20 scores. Notice that they are listed in order from 0.9 to 5.8, but that some of the scores are obscured by ***, The mean , M, of these scores is 4.0.

Suppose you are asked for the sample standard deviation of these scores. Since you don’t have all of them, you cannot calculate it. Which of the following is the estimate of the sample standard deviation?

A. 0.3

B. 4.9

C. 3.7

D, 1.4

The base of a triangle exceeds the height by 9 inches. if the area is 180 square inches, find the length of the base and the height of the triangle.

Stacey filled her 1/2 cup of measuring cup seven times to have enough flour for a cake recipe how much flour does the cake recipe calls for

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.