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<p><span style="font-size: medium;"><strong><span style="font-family: 'times new roman',times,serif;">Battery Life Spans</span></strong></span></p> <p><span style="font-family: 'times new roman',times,serif; font-size: medium;">The life span of a battery is normally distributed, with a mean of 2000 hours and a standard deviation of 30 hours. </span></p> <ol> <li><span class="Apple-style-span" style="font-family: 'times new roman',times,serif; font-size: medium;">What percent (to three significant figures) of batteries have a life span that is more than 2065 hours?<br />{1:NM:=1.51}%<br /><br /></span></li> <li><span class="Apple-style-span" style="font-family: 'times new roman',times,serif; font-size: medium;">Would it be unusual for a battery to have a life span that is more than 2065 hours?<br />{1:MCV:=Yes~No}</span></li> </ol>
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Tuesday, 5 November 2013, 10:15 AM
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