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math-340:m340-f15-hw:hw-20 [2015/11/03 18:00] dcs |
math-340:m340-f15-hw:hw-20 [2015/11/15 03:32] (current) dcs |
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- | - 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. |