Scores on a university exam are normally distributed with a mean of 68 and a standard deviation of 9. using the 68-95-99.7 rule, what percentage of students score above 77?
a. 2.5%
b. 5%
c. 16%
d. 32%

answer rather than having to add and subtract the measurements of the semi-circle, notice that the semicircle to the left of ad is actually identical in area to the blank semicircle-shaped space to the left of bc. so if we transferred the red semicircle into the blank space, we would end up with a square of side length 24 cm. the area of a square is s^2 = 24^2 = 676 cm^2.

u also answered this so i think u would know but i am here to

put in or use mine

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