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so it will be 90-90,90-90,90-80,90-100,etc @jim_thompson5910

yes and the results will all go in that column

are u sure its not the mean -score @jim_thompson5910

hello

it's score - mean

that's what the xi - xbar means
xi is the score

|dw:1433566821653:dw|

|dw:1433566832765:dw|

so some will be negative @jim_thompson5910

|dw:1433566847436:dw|

yes it's normal to have negative differences

so how I find the total? @jim_thompson5910

you add up all of the numbers in the column to get the total

you'll have 3 totals (one per column)

now take the absolute value of each result
that will form the next column over

|0| = 0
|0| = 0
|-10| = 10
etc etc

so will |10| be -10 or just stay 10 @jim_thompson5910

anything positive will stay the same

absolute value measures distance that number is from 0

distance is never negative

add em all up for the total again @jim_thompson5910

yes

how to find the variance @jim_thompson5910

square everything in column 1 to get column 3

0^2 = 0
0^2 = 0
(-10)^2 = 100
10^2 = 100
etc etc

did u get 490 for the total of the variance @jim_thompson5910

divide 490 by 8 to get the variance

what do these measures of spread tell you about Bryce grades? @jim_thompson5910

I'm not sure what kind of answer they want here

But the general rule is that the larger the standard deviation, the more spread out the scores are