"A generator manufacturer found that the smallest, least expensive generator that they manufacture lasts, on average,
2000 hours with a standard deviation of 150 hours. At least what percent of the generators last between 1550 and 2450
hours?"
1. What is the mean?

2. What is the standard deviation?

3. 1550 is ___ standard deviations (below/above?) the mean and 2450 is ___ standard deviations (below/above?) the mean.

4. Based on Chebyshev's Theorem, what percent of the generators can the company expect to last between 1550 and 2450 hours?
-The company can expect (at most, exactly, or at least?) __% of the generators to last between 1550 and 2450 hours.
(Round to the nearest tenth)