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## Homework Statement

An airline flies the same route at the same time each day. The flight time varies according to a Normal distribution with unknown mean and standard deviation. On 15% of days, the flight takes more than an hour. On 3% of days, the flight lasts 75 minutes or more. Use this information to determine the mean and standard deviation of the flight time distribution.

## Homework Equations

well, i can use the normalcdf, normalpdf and invNorm on the TI, but i'm not sure how, since to use them, i need the standard deviation and the mean

## The Attempt at a Solution

what i have attempted is using those tools on the calculator, but it doesn't really get you to anything