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math-340:m340-f15-hw:hw-20 [2015/11/03 18:00]
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math-340:m340-f15-hw:hw-20 [2015/11/15 03:32] (current)
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 Also: Also:
  
-  - Suppose the lifetime of a certain tire has a normal distribution with mean 50,0000 miles and standard deviation 5000 miles. Find:+  - Suppose the lifetime of a certain tire has a normal distribution with mean 50,000 miles and standard deviation 5000 miles. Find:
     - The probability that a tire will last between 48,000 and 56,000 miles.     - The probability that a tire will last between 48,000 and 56,000 miles.
     - Find the value $a$ such that the probability that a tire lasts more than $a$ miles is approximately 0.8.     - Find the value $a$ such that the probability that a tire lasts more than $a$ miles is approximately 0.8.