How large of a sample is needed in order for the sample range to serve as a 99% tolerance interval that contains 90% of the population? How large must the sample be in order to have 95% confidence...

How large of a sample is needed in order for the sample range to serve as a 99% tolerance interval that contains 90% of the population?

How large must the sample be in order to have 95% confidence that at least 90% of the population is less than X_(n-l)
n?