The chance that UPS will deliver a package to a customer within X days is normally...
The chance that UPS will deliver a package to a customer within X days is normally distributed with a mean of 6 and a standard deviation of 1.3. If there is a 90% chance that the package arrives in X days, how many days will the package take to arrive?
Homework Answers
z score for 90 percent confidence interval is 1.64
We have x = u + z*s
Thus, x = 6+1.3*1.64
X = 8.13 days
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