Find the indicated probability by using the general addition rule. The manager o

Question

Find the indicated probability by using the general addition rule. The manager of a bank recorded the amount of time each customer spent waiting in line during peak business hours one Monday. The frequency table below summarizes the results. Watting Time Number of (minutes) Customers 0-3 4-7 8-11 12-15 16-19 20-23 24-27 15 It we randomly select one of the times represented in the table, what is the probability that it is at least 12 minutes or betveen 8 and 15 minutes 0.564 0.109 0.625 0.455 05 PM Type here to search

Explanation / Answer

total customer = 15+15+9+6+8+1+1 = 55

P(X >= 12 or 8 <= X<= 15)
= P(X>= 8)
= 1- P(X < 8)
= 1 - (15+15)/55
= 0.4545

hence option D) 0.455 is correct
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