Answer:
Step-by-step explanation:
True
Solution :
Let :
X = number of overtime hours
S = total weekly salary
S = 
S = 480 + 18X
E(S) = 

= 750
Mean of S = 750
Var (S) = 
Var(S) = 
= 5184
Variance of S = 5184
The standard deviation equals square root of 5184 = 72
Sorry
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The answer to the problem is D
35 : 15 is the same as 7 : 3
Nobody knows. We can't see the graphed line.