5.19 An important feature of golf cart batteries is the number of minutes they will perform before...

Question:

5.19 An important feature of golf cart batteries is the number of minutes they will perform before needing to be recharged. A certain manufacturer advertises batteries that will run, under a 75-amp discharge test, for an average of 100 minutes, with a standard deviation of 5 minutes.

a Find an interval that must contain at least 90% of the performance periods for batteries of this type.

b Would you expect many batteries to die out in less than 80 minutes? Why or why not?

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