Question

How do you find the variance of 7448, 4911, 9051, 6374, 4277

Answer 1

You'll need to find the mean first.

Variance is... The average of the squared differences from the Mean.

To calculate the variance:

Work out the Mean (the simple average of the numbers)

Then for each number: subtract the Mean and square the result (the squared difference).

Then work out the average of those squared differences.

Answer 2

i got 6412.2 as the mean is that right?

Answer 3

Yep http://www.wolframalpha.com/input/?i=mean+of++7448%2C+4911%2C+9051%2C+6374%2C+4277

Now:

for each number: subtract the Mean, and square the result

Answer 4

so the first number for example would be 1072881.64?

Answer 5

If that is (7448-6412.2)^2, which it appears to be from estimation, then yes

Answer 6

ok so what do i do with all those answers

Answer 7

for each number: subtract the Mean and square the result (the squared difference).

Then work out the average of those squared differences.