1. The amount of time an alkaline battery lasts is normallydistributed with a mean life of
19 hours and standard deviation of 1.2 hours.
(a) 68% of all batteries will last between ____________ hrs. and_____________ hrs.
(b) 95% of all batteries will last between ____________ hrs. and_____________ hrs.
(c) What percent of the batteries will have a life that exceeds16.6 hours? _________
(d) What percent of the batteries will have a life that lastsbetween 15.4 and 22.6 hours? ______
(e) If a company purchases 10,000 batteries, how many batteries areexpected to last
ï‚· more than 17.8 hours? ___________
ï‚· between 15.4 and 20.2 hours? ____________
