A passenger metal detector at Lisbon's Airport gives an alarm 2.4 times a minute, on average.

What is the probability that more than 30 seconds will pass before the next alarm?

In an exponential distribution, the median is greater than the mean.

A passenger metal detector at Lisbon's Airport gives an alarm 1.7 times a minute, on average.

What is the probability that more than 30 seconds will pass before the next alarm?

Between 11 PM and midnight on Thursday night, Mystery Pizza gets an average of 4.2 telephone orders per hour. 

Find the upper quartile of waiting time before the next telephone order.

The normal distribution is always symmetric, regardless of the mean and standard deviation.

Consider the following CDF for the continuous uniform random variable X:

, for 

What is the median of X?

Consider the following CDF for the continuous random variable X:

What is ?