Thread: probability

A survey found that people keep their television sets an average of 4.8 years.the standard deviation id 0.89 year.if a person is selected at random.find these probabilities.
a.) less than 2.5 years?
b.) between 3 and 4 years?
c.) more than 4.2 years?

Originally Posted by alderon

A survey found that people keep their television sets an average of 4.8 years.the standard deviation id 0.89 year.if a person is selected at random.find these probabilities.
a.) less than 2.5 years?
b.) between 3 and 4 years?
c.) more than 4.2 years?

There is no way of telling without knowing the distribution, however Chebyshev's inequality
will give bounds for some of these.

Now if you want us to assume a distribution, or there is a distribution
associated with this question that you have not mentioned please say.

RonL