Final answer:
This question is asking about various distributions and probabilities related to the length of time batteries last.
Step-by-step explanation:
The question is asking about the distribution of the length of time one battery lasts, the distribution for the mean length of time 64 batteries last, the distribution for the total length of time 64 batteries last, the probability that the sample mean is between 7 and 11, the 80th percentile for the total length of time 64 batteries last, the interquartile range (IQR) for the mean amount of time 64 batteries last, and the middle 80 percent for the total amount of time 64 batteries last.