1. The length of time it takes to complete a word puzzle is found to be normally distributed with a mean of 80 seconds and a standard deviation of 10 seconds. Using the 50%-34%-14% figures, approximately what percentage of scores (on time to complete the word puzzle) will be a) Above 100 seconds b) Below 100 seconds c) Above 90 seconds d) Below 90 seconds e) Above 80 seconds f) Below 80 seconds g) Above 70 seconds h) Below 70 seconds i) Above 60 seconds j) Below 60 seconds

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Table #1:

Using the first two points (2,1) and (5,3)

You get (x-2)/3 = (y-1)/2

But then the 3rd point (8,7) does not work, so this is not linear.

Table #2

Using the first two points (1,10) and (2,13)

You get x-1 = (y-10) /3

But then the 3rd point (3,18) does not work so this is also not linear.

Table #3

Using the first two points (2,1) and (4,6)

You get x-2 /2 = y-1 /5

And all the other points will work with this, which makes this table linear.

Rewrite the equation to get y = 5/2x-4