Question

A student has the following grades: 80, 76, 78, 83, 83. Find the variance of the grades.

1) 7.6
2) 4.2
3) 0
4) 2.8

Answer 1

\[\sigma^2=\frac{\sum_{i=1}^{n}x _{i}^2-\mu^2}{n}\]

Answer 2

we use the ti83 in stats class; and I get a mu of 2.75

Answer 3

lol .... um.. omega of 2.75

Answer 4

omega^2 is the variance

Answer 5

(2.75)^2

Answer 6

You mean sigma?

Answer 7

\[\sigma \] ..... doh!! yes :)

Answer 8

I make it 7.49?

Answer 9

i get 7.5625

Answer 10

You said you get a mu of 2.75, do you mean mu? Because mu is the mean.

Answer 11

Lol! I put the answers in as data instead of the actual data. The actual answer is 7.60.

Answer 12

me and latin are gonna have to have a talkin with ;)

Answer 13

You mean Greek?