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
Does that say hundred thousands if so the value is 6
Answer:
c
Step-by-step explanation:
i am 99.99% sure it is c
Answer:
x=1
Step-by-step explanation: