3. Bubba's Burgers is a fast food establishment serving students on a college campus. Bubba's serves only one meal: a burger, a bag of chips and a Coke. When a customer arrives at the
counter, the number meals he or she orders is given by the following probability distribution:
# Meals Ordered
1
2
3
5
6
Probability
10%
25%
?
10%
10%
10%
a. Find the probability that 3 meals were ordered
b. What is the expected number of meals a customer will order??