Question 1

a) Suppose that X is a random variable that represents the number of people waiting at the line ata fast-food restaurant and it happens to only take the values 2, 3 or 5 with probabilities 2/10,3/10 and 5/10respectively.

i. Find the expected value and standard deviation for the variable X.

ii. Find the probability there are more than 3 people waiting at the line at fast-food restaurant.