Question

Math help ?

Answer 1

@jim_thompson5910 @phi

Answer 2

what's up?

Answer 3

What are the mean, variance, and standard deviation of these values? Round to the nearest tenth.

Answer 4

@Directrix

Answer 5

Let's find the mean first

Answer 6

how do we do this?

Answer 7

the mean is 47.6

Answer 8

good, add them up and divide by 5

Answer 9

how about the variance?

Answer 10

31?

Answer 11

I think they want us to find the sample variance

Answer 12

so you would add up the values in the last column

then divide by 4 (one less than the number of items)

Answer 13

so would it be 65.3

Answer 14

ad them up to get: 29.2+11.6+0.2+2+112.4 = 155.4

Answer 15

yes and you get 31

Answer 16

then divide by 4 to get 155.4/4 = 38.85

Answer 17

38.85 isnt on my answer choice.

Answer 18

ok so they probably want the population variance

Answer 19

155.4/5 = 31.08

Answer 20

Thats my answer choice. And this is the problem iv been stuck on since 4pm

Answer 21

close enough to 31 i guess

Answer 22

its 11:29pm lol

Answer 23

True. So is my SD 5.6 ?

Answer 24

then take the square root of 31 to get sqrt(31) = 5.56776436283002

Answer 25

yep, that rounds to 5.6

Answer 26

So that means my answer is A ?

Answer 27

@jim_thompson5910

Answer 28

correct

Answer 29

Susan keeps track of the number of tickets sold for each play presented at the community theater. Within how many standard deviations of the mean do all the values fall?

135, 71, 69, 80, 158, 152, 161, 96, 122, 118, 87, 85

Answer 30

Is my answer 2 ?

Answer 31

one sec

Answer 32

I'm assuming you have answer choices here as well?

Answer 33

huh ?

Answer 34

is this a multiple choice question?

Answer 35

A)3
B)4
C)5
D)2

Answer 36

like the last one

Answer 37

ok thx

Answer 38

Is my answer 2?

Answer 39

one sec, finding the standard deviation

Answer 40

Kk

Answer 41

yes it's 2 since everything is within the interval (mu - 2*sigma, mu + 2*sigma)

Answer 42

The graph below displays how many pieces of candy Timmy and his five friends each received last Halloween. Within how many standard deviations of the mean do the values fall?

Answer 43

You there ?

Answer 44

yeah trying to work it out

Answer 45

K

Answer 46

this is another 2 as well, for the same reasons

Answer 47

Thank you. Is 2 my answer

Answer 48

yes

Answer 49

Thank you

Answer 50

yw

Answer 51

These are all correct (And the first answer on this quiz, which isn't on this post, is B)

Answer 52

@cagliero423 OS needs more ppl like you....whats the last one tho? number 4