Reference no: EM132351410

"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? ________hours

3. 1550 is ______ standard deviations (below or above) the mean and 2450 is ______ standard deviations (below or above) the mean.

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 (almost, exactly, at least) ______% rounded to the nearest tenth.

"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.

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

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

We can expect that at least 75% of the bacteria to live between _______ and ________ minutes.

(Enter ?x-ks? in the first blank and ?x+ks? in he second blank)