g) The manager is particularly concerned the chance that customers need to wait longer than 2 minutes. She summarized th

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G The Manager Is Particularly Concerned The Chance That Customers Need To Wait Longer Than 2 Minutes She Summarized Th 1 (51.63 KiB) Viewed 41 times

g) The manager is particularly concerned the chance that customers need to wait longer than 2 minutes. She summarized the waiting times of the two types of counters in the following table, use it to calculate: i) the two probabilities that a randomly selected customer of using the cashiers has waited longer than 2 minutes; ii) the probabilities that a randomly selected customer who have waited at least 2 minutes has used the self-serve counters; iii) Show whether the waiting time for the two types of counters are independent. (8 marks) Wait less than 2 Wait at least 2 No. of customers minutes minutes 87 140 131 74 218 214 Cashiers Self-serve counters Total Total 227 205 432