7. (Sec. 5.4) The lifetime of a certain type of battery is normally distributed with mean value 10 hours and standard deviation 1 hour. (a) If a pack of 4 batteries is purchased, what is the probability that the average lifetime of the batteries in the package is at least 9 hours? (b) How many batteries must be purchased such that the probability that their average lifetime is at least 9.5 hours is .99?

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.