1. In the table below, the random variable x represents the number of cups or cans of caffeinated beverages consumed by Americans each day based on data from the National Sleep Foundation.
X P(x)
0 0.22
1 0.16
2 0.21
3 0.16
Determine whether or not a probability distribution is given.
a. If a probability distribution is given, find its mean and standard deviation.
b. If a probability distribution is not given, identify the requirements that are not satisfied.