Micron Technology has sales offices located in four cities: Dallas, Seattle, Boston, and Los Angeles. An analysis of the company€™s accounts receivables reveals the number of overdue invoices by days, as shown here.

Assume the invoices are stored and managed from a central database.
a. What is the probability that a randomly selected invoice from the database is from the Boston sales office?
b. What is the probability that a randomly selected invoice from the database is between 30 and 90 days overdue?
c. What is the probability that a randomly selected invoice from the database is over 90 days old and from the Seattle office?
d. If a randomly selected invoice is from the Los Angeles office, what is the probability that it is 60 or fewer days overdue?

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Days Overdue Dallas Seattle Boston Los Angeles Under 30 days 137 2 198 30-60 days 61-90 days Over 90 days 85 33 18 46 27 32 287 109 48 76 45