Answer:
x=24 y=15
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Solution: We are given:

We know that a usual values of the test scores falls within 2 standard deviation from the mean.
Therefore, the minimum usual test score is:




The maximum usual test score is:




Therefore, the minimum and maximum “usual” values of the test scores are:
65.4 and 90.6
my best guess is (-1,1) (-1,2) (-2,3), i just drew a line graph and plotted the points and connected where the x axis lines meet