"Bacteria in a culture can live for an average of two hours with a standard deviation of 15 minutes. How long can we expect at least 75% of the bacteria to live?"

1. What is the mean? x=___ hours = ___ minutes (Convert the number of hours to minutes.)

2. What is the standard deviation? s= ___ minutes

3. According to Chebyshev's Theorem, how many standard deviations contain at least 75% of the data? k= ___

4. We can expect the at least 75% of the bacteria to live between ___

and ___ minutes.