Question

what is the standard deviation of 1 2 3 6 8?

Answer 1

Can you find the mean, first?

Answer 2

first find the mean: \[
\mu = \frac{1+2+3+6+8}{5}
\]

Answer 3

is the answer 4?

Answer 4

Then find std dev: \[
\sigma = \sqrt{\frac{(1-\mu)^2+(2-\mu)^2+(3-\mu)^2+(6-\mu)^2+(8-\mu)^2}{5}}
\]

Answer 5

No, 4 would be \(\mu\), the mean

Answer 6

Then plug that into the equation I gave you for \(\sigma\).

Answer 7

is it 2.607680962

Answer 8

http://www.wolframalpha.com/input/?i=standard+deviation+1+2+3+6+8

Answer 9

thank you! so it would be 2.9

Answer 10

Yes

Answer 11

In a sample of 800 people, 32 people said their favorite fruit was an apple.

Determine the empirical probalility that a person's favorite fruit is an apple.

Answer 12

can you help me with that?