A sample of Geometry class final exam grades are as follows:
80, 85, 72, 76, 95
Find the variance.

Question

anonymous · Answer

what is variance

amistre64 · Answer

variance is the standarad deviation without the square root :)

anonymous · Answer

o

amistre64 · Answer

mean = 81.6
variance =(8.90505)^2

amistre64 · Answer

80-81.6 = .... alot of hard work lol
85-81.6 =
72-81.6 =
76-81.6 =
95-81.6 =

anonymous · Answer

so subtract them

amistre64 · Answer

its about 79.3

anonymous · Answer

rounded or not

amistre64 · Answer

subtract them; square them; add them; divide by n-1 where n is the number of data points collected; and there ya go :)

amistre64 · Answer

rounded; but i dont know how your answer looks, you got options?

anonymous · Answer

i think im gonna give up on this problem

anonymous · Answer

1) 63.44 
 2) 7.96 
 3) 49.23 
 4) 6.72

amistre64 · Answer

yeah, one down aint goona hurt much ;)

anonymous · Answer

yea

anonymous · Answer

and those are the answers i have

anonymous · Answer

i know how you feel these stats problems are a lot of tedious work

anonymous · Answer

yes

anonymous · Answer

some calculators make it a bit easier

anonymous · Answer

yea

amistre64 · Answer

if we are doing population variance; it closer to 64

amistre64 · Answer

choose the first option :)

anonymous · Answer

i jst guessed