Question

stats..?

Answer 1

@ash2326

Answer 2

@dianadelucio you know what variance is?

Answer 3

? :/

Answer 4

subtract the mean from the given Xs and square the results

then take the average of those results

Answer 5

might have to amend that some

Answer 6

mean is when you add and divide by how many terms, right ?

Answer 7

@ankit042 noo i dont\

Answer 8

\[{7(\bar x-13)^2+21(\bar x-16)^2+17(\bar x-18)^2+25(\bar x-21)^2\\+5(\bar x-23)^2+4(\bar x-25)^2+13(\bar x-26)^2+8(\bar x-31)^2}\\-----------------------\\~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~{100}\]

something like that is the way i see it

Answer 9

i got 21.625

Answer 10

how do i subtract the mean?
subtract from what?

Answer 11

variance describes how far number lie from the mean.
Now we know that the mean of this distribution is 20.59.
You can easily calculate the value using formula told by @amistre64

Answer 12

i got the corrrect answer, :) thansk tho! :)

Answer 13

site went out on me

Answer 14

me tooo :l @amistre64

Answer 15

i used excel, and then had a moment of clarity with my ti83 .... i get 23.1819 when i worked it all out. you say you got 21.625?

Answer 16

yeaa but mine was wronggg

Answer 17

the answer was 23.18

Answer 18

whew! i was right then :)