A is the answer because to find a area you need to multiply each side
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
Answer:B.
Step-by-step explanation:
How many girls like sports? well, what's 2/5 of 1200? well, is just their product, 2/5 * 1200.
how many boys like sports? well, what's 3/5 of 1200? 3/5 * 1200.