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2.A batch of 5000 electric lamps has a mean life of 1000 hours and a standard deviation of 75 hours. Assuming a normal distribution:
2.A batch of 5000 electric lamps has a mean life of 1000 hours and a standard deviation of 75 hours. Assuming a normal distribution: 2.1. How many lamps will fail before 900 hours? 2.2. How many lamps will fail between 950 and 1000 hours? (10) (10) 2.3. And given the same mean life, what would the standard deviation have to be to ensure that not more than 20% of lamps fail before 916 hours? (10)
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21 To calculate how many lamps will fail before 900 hours we need to find the zscore for 900 hours u...
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Elementary Statistics Picturing The World
Authors: Ron Larson, Betsy Farber
6th Edition
0321911210, 978-0321911216
