Question: James is expecting three checks in the mail, for $20, $26, and $33 dollars. Their arrivals are the events A, B, C. Assume the class is independent, with respective probabilities 0.90, 0.75, 0.80. Then
X = 20IA + 26IB + 33IC
represents the total amount received. Determine the distribution for X. What is the probability he receives at least $50? Less than $30?