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Unformatted text preview: center bar 85 hrs (i.e., 98 – 1x13), 72 hrs (i.e., 98 – 2x13), and 59 hrs (i.e., 98 – 3x13). To answer question b., let’s recognize that a lightbulb selected at random will either burn out: 1. In less than 111 hours, or 2. In more than 111 hours. The probability that a lightbulb selected at random will last longer than 111 hours is: 0.1% + 2.2% + 13.6% = 15.9% … Almost… Since probabilities are reported in decimal form, we would say the probability that a lightbulb selected at random will last longer than 111 hours is: 0.159 Here’s another example: The probability that a lightbulb selected at random will last between 85 and 111 hours is: 0.682; i.e., 0.341 + 0.341 98 hrs 111 hrs 124 hrs 137 hrs 85 hrs 72 hrs 59 hrs...
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 Fall '11
 Adjunct
 Math, Normal Distribution, Standard Deviation, 0.1%, 2.2%, 13.6%, 15.9%

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