User Tools
Differences
This shows you the differences between two versions of the page.
| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| math-340:m340-f15-hw:hw-20 [2015/11/03 17:45] – dcs | math-340:m340-f15-hw:hw-20 [2015/11/15 03:32] (current) – dcs | ||
|---|---|---|---|
| Line 11: | Line 11: | ||
| 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. | ||
| Line 20: | Line 20: | ||
| **For Problem Set due 2 November**: 47, 54 | **For Problem Set due 2 November**: 47, 54 | ||
| + | |||
| + | Answers: | ||
| + | |||
| + | - (a) 0.5403 (b) 45,800 | ||
| + | - (a) 0.2019 (b) 14,979 | ||
