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.
What is the probability that a randomly selected invoice from the database is between 30 and 90 days overdue?
A)0.2702
B)0.0231
C)0.3461
D)0.7765

Question

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.
What is the probability that a randomly selected invoice from the database is between 30 and 90 days overdue?
A)0.2702 
B)0.0231 
C)0.3461 
D)0.7765

Quizplus · Accepted Answer

To find the probability of a randomly selected invoice between 30 and 90 days overdue, we need to find the total number of invoices that are between 30 and 90 days overdue and divide it by the total number of invoices. 
Total number of invoices between 30 and 90 days overdue = 1,550 + 1,100 + 1,530 + 960 = 5,140 
Total number of invoices = 5,140 + 1,120 + 4,760 + 1,430 = 12,450 
Probability of a randomly selected invoice between 30 and 90 days overdue = 5,140 / 12,450 = 0.3461 
Therefore, the best choice is C.

Micron Technology Has Sales Offices Located in Four Cities: Dallas,Seattle,Boston,and