Question

What is the variance of the following data? If necessary, round your answer to two decimal places.
13, 11, 4, 5, 6, 9, 10, 12, 15, 16

Answer 1

16.34

17.15

15.29

14.36

Answer 2

we need the mean to calculate it

Answer 3

26?

Answer 4

we dont really need to do it with this data set, we can work it with an equivalently spaced set; lets see what we get when we subtract 10 from every point.

(13, 11, 4, 5, 6, 9, 10, 12, 15, 16)-10

3, 1, -6, -5, -4, -1, 0, 2, 5, 6

3, -4,0, 2 = 1

1/10 for a mean

add back 10 to get the original mean of the data set; 101/10

Answer 5

id prolly rather play with the modified set

Answer 6

subtract the mean from each point and square the results

Answer 7

b?

Answer 8

(3, 1, -6, -5, -4, -1, 0, 2, 5, 6) - 1/10

29/10
9/10
-61/10
-51/10
-41/10
-11/10
-1/10
2, 5, 6) - 1/10

b what? i cant tell what it would be till we get to the end

Answer 9

the wolf says it aint b

Answer 10

ok..

Answer 11

2.9
.9
-6.1
-5.1
-4.1
-1.1
- .1
1.9
4.9
5.9

i wonder if we can approximate this and still get a valid result

Answer 12

9+1+36+25+16
+1+0+4+25+36
-----------------
10+1+40+50+52

51+52+53 = 156/10 = 15.6

Answer 13

the wolf says 15.29; so thats alot easier to deal with lol

Answer 14

thanks alot for the breakdown!!

Answer 15

i needed the practice ;) good luck