Question

For the distribution, find (a) the mean, (b) the variance, and (c) the standard deviation to the nearest tenth.

Answer 1

42,46,50,50,52,,54,56

Answer 2

Am I doing it right.

Answer 3

@Luigi0210 @FibonacciChick666

Answer 4

yea, that's the mean

Answer 5

what is the standard deviation though? :/

Answer 6

@AravindG @cwrw238 @happytales @tHe_FiZiCx99 @SithsAndGiggles

Answer 7

Use the formula :3

Answer 8

I really can't figure out the standard deviation or the variance... I get like 27.1 for the standard deviation, which is incorrect.

Answer 9

\(\ \sf \sigma = \sqrt{\Sigma\dfrac{(x - x̄)^2}{n}}\)


X_X that took awhile >.>

Answer 10

so what would I plug in? or what is x equal to??

Answer 11

an n= ?

Answer 12

Σ = take the sum of
x = each data value
x̄ = mean of all the data values
n = number of data values

Answer 13

so x=350?

Answer 14

No, don't add them.

:o this is going to take sometime :3

First calculate the mean, you said the mean was 50. So I'll trust you :3

1. Subtract the mean from each data point.

2. Square the differences you found in step 1

3. Add the squares from step 2

4. Divide the sum from step 3 by the number of data values

5. Find the square root of the number from step 4

Answer 15

is the drawing I made correct so far?

Answer 16

Looks blurry to me ;_;

Answer 17

this is too hard... I might quit lol

Answer 18

the deviations without being squared are -8,-4,50,2,4,6 correct?

Answer 19

Honestly it looks hard but it really isn't :O

Take your data values, and subtract them with the mean, or 50
42 - 50 = -8
46- 50 = -4
50- 50 = 0
50- 50 = 0
52- 50 = 2
54- 50 = 4
56- 50 = 6

Now square each of those new values, add them up and divide by how many there are and that's it

Answer 20

it was the 50-50, I was doing 100-50! smh

Answer 21

Lel, I copied the data you had above, hopefully those were your values and your mean is correct

Answer 22

so 64+16+0+0+4+16+36/7

Answer 23

thank you!

Answer 24

Yes, 19.42 is the Variance, the standard deviation is the square root of that, which is 4.40

Answer 25

yep , that's what I got! Thanks again!

Answer 26

You're welcome :>