I'm lost on how to work with probability..please help?

1. The following data represents the number of games played in each World Series from 1923 to 2005.


x (games played) Frequency


4------------------------------------- 15


5------------------------------------- 15


6------------------------------------- 18


7------------------------------------- 33





a) Construct a discrete probability distribution for the random variable X.


b) Sketch the probability histogram.


c) Compute and interpret the mean of the random variable X.

I'm lost on how to work with probability..please help?
Yes! You definitely need help!!!!





You must define Random Variable "x". Is it "Year"?? Is it "World Series game number 4"? or something else???





"Frequency" is meaningless unless Random Variable "x" is defined.