Answer:
90
Step-by-step explanation:
90 degree angles are angles with a 90 degree turn
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➷ Standard deviation = 
Substitute the values in:
= 8.1975...
This can be rounded to give an approximate answer of 8.2
The answer is option A.
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F(7)= -22 - 3(7) + 3
f(7)= -22 - 21 +3
f(7)= -40
Hope that helps!