To answer (a), we will need to find the Z value for 710 hours and 990 hours.


B) 68% of data lies between one standard deviation of the mean.
850 +70 = 920
850 - 70 = 780
Is there an imagine you forgot to attach to the question? would love to help but i don’t see any options :(
C. 9y + 13
9y is the same as 9 times y (a variable representing a number), + 13
B, Your welcome.factor <span><span>16y</span>+12</span><span><span>16y</span>+12</span><span>=<span>4<span>(<span><span>4y</span>+3</span><span>)</span>
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