Question

The test scores for a math class are shown below.

81, 85, 82, 93, 85, 84, 95, 87, 88, 91




25.
What are the mean, median, and mode of the data set? (1 point)mean: 87; median: 85; mode: 87.3
mean: 85; median: 87.1; mode: 86
mean: 87.3; median: 87; mode; 85
mean: 87.1; median: 86; mode: 85






26.
What is the standard deviation of the data set? Round your answer to the nearest tenth. (1 point)2.7
4.4
11.6
19.5
@Luis_Rivera @bnkilinc @kropot72

Answer 1

The first step is to arrange the data values in ascending order, left to right. Can you please do that an post the result?

Answer 2

81,82,84,85,85,87,88,91,93,95

Answer 3

@kropot72

Answer 4

@perl

Answer 5

Good ordering. To find the mean, add up the 10 values and divide the total by 10. Can you do that?

Answer 6

@freshkid944 Have you got a result for the mean yet?

Answer 7

87.1 @kropot72

Answer 8

thanks!!! now how do I get number 2?

Answer 9

Good work. The median is the middle value. In this case with 10 values, there is no value in the middle. Therefore we find the average of the two value either side of the center. These value are 85 and 87. Do you know the average of these? It is found by
\[\frac{85+87}{2}=?\]

Answer 10

values*

Answer 11

128.2 @kropot72

Answer 12

\[\frac{85+87}{2}=\frac{172}{2}=?\]

Answer 13

86 @kropot72

Answer 14

Correct! So we will now find the mode. What value occurs most often in the ordered set of data that you made?

Answer 15

the mode is 85 :)

Answer 16

@kropot72

Answer 17

Correct. So we have mean = 87.1, median = 86 and mode = 85. This fits one of the choices.
Are you allowed to use a computer or a statistical calculator to find the standard deviation?

Answer 18

yes

Answer 19

Do you have a calculator that can find the standard deviation?

Answer 20

yes it was 4.4 @kropot72

Answer 21

Yes, I get 4.4 also.