Question

4, 15, 10, 8, 33, 25, 36, 66, 63, 50, 64, 49, 40. Find variance?

Answer 1

I can get the answer from online calculator but I need to know the steps...

Answer 2

Can you find mean here??

Answer 3

You just want square of mean deviations here..

Firstly find Mean and then mean deviation..

Answer 4

Okay..

Simply add all the data here.. @pagalbilal

Answer 5

mean is 35.6154

Answer 6

http://www.mathsisfun.com/data/standard-deviation.html

Answer 7

Yes Mean is right..

Answer 8

You have to do long calculation here..

Now:

|4 - 35.6| = ??

|15 - 35.6| = ??

|10 - 35.6| = ??

Like wise subtract all the data from mean and you will get here Mean Deviations..

Answer 9

ok what about "The number of complaint letters received by the USPS in a given day are' is that quantitative or qualitative ?

Answer 10

ohhh I see...I m working on it nw

Answer 11

Then take the square of every difference also and add them like:

for first one :

|4 - 35.6| = 31.6 (now square it : 998.56)

|15 - 35.6| = 20.6 (Now square it: 424.36)

Like wise finding and squaring all the differences then you will add them..

By this you will get Standard Deviation but you are to find Variance:

As Variance is square of Standard Deviation...

After finding SD then square it you will get Variance..

Answer 12

ok thank you very much for your help...