With reference to Exercise 71, what can we assert about the amount of time it takes a person to be served at the given restaurant if we use Chebyshev's theorem with k = 1.5? What is the corresponding probability rounded to four decimals?
Exercise 71
The amount of time it takes a person to be served at a given restaurant is a random variable with the probability density
![](https://test.transtutors.com/qimg/7bff2890-8716-4a81-91ca-6e7b1c67b2d7.png)
Find the mean and the variance of this random variable.