Chapter 4: Discrete Random Variables

Find the probability that Javier volunteers for at least one event each month.

$P(x>0)=\_\_\_\_\_\_\_$

Complete the expected value table.

Find the expected value from the expected value table.

$P(x=4)$= _______

Find the standard deviation.

Identify the mistake in the probability distribution table.

Identify the mistake in the probability distribution table.

Use the following information to answer the next five exercises: A physics professor wants to know what percent of physics

majors will spend the next several years doing post-graduate research. He has the following probability distribution.

Define the random variable X.

Define $P(x),$or the probability of$x.$

Find the probability that a physics major will do post-graduate research for four years.

$P(x=4)=\_\_\_\_\_\_\_$