MP3s Two companies market new batteries targeted atowners of personal music players. DuraTunes claims a mean battery life of 11 hours, while RockReady adver-tises 12 hours. a) Explain why you would also like to know the standarddeviations of the battery lifespans before decidingwhich brand to buy.b) Suppose those standard deviations are 2 hours forDuraTunes and 1.5 hours for RockReady. You areheaded for 8 hours at the beach. Which battery is mostlikely to last all day? Explain.c) If your beach trip is all weekend, and you probablywill have the music on for 16 hours, which battery ismost likely to last? Explain.

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Author:Amos Gilat
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MP3s Two companies market new batteries targeted at
owners of personal music players. DuraTunes claims a
mean battery life of 11 hours, while RockReady adver-
tises 12 hours.
a) Explain why you would also like to know the standard
deviations of the battery lifespans before deciding
which brand to buy.
b) Suppose those standard deviations are 2 hours for
DuraTunes and 1.5 hours for RockReady. You are
headed for 8 hours at the beach. Which battery is most
likely to last all day? Explain.
c) If your beach trip is all weekend, and you probably
will have the music on for 16 hours, which battery is
most likely to last? Explain.
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