A call center for customer support records the time each customer requires for service and whether the call occurred during the week (Monday through Friday) or during the weekend (Saturday and Sunday). The results are shown in the following table:

Time (Minutes) Week Weekend Less than 5 15 3 5 to less than 10 26 4 10 to less than 15 11 9 15 to less than 20 22 6 More than 20 10 14 Determine the probability that a randomly selected call

a. was during the week

b. was less than 20 minutes

c. was 10 to less than 20 minutes

d. was more than 20 minutes during the weekend

e. was 15 to less than 20 minutes or occurred during the weekend

f. was 5 to less than 10 minutes, given it occurred during the week g. occurred during the week, given it was 5 to less than 10 minutes h. Construct a decision tree for these events.

AppendixLO1