(9 - 11) Suppose customers arrive at a shop on the average of 30 per hour in accordance with a Poison process. 9. What is the probability that the shopkeeper will have to wait longer than 23.68 minutes until the seventh customer arrives? (a) 0.05 (b) 0.07 (c) 0.95 (d) 0.99 10. What is the probability that the shopkeeper will wait less than 4.660 minutes until the seventh cus- tomer arrives? (a) 0.01 (b) 0.99 (c) 0.90 (d) 0.10 11. What is the probability that the shopkeeper will wait between 6.571 and 29.14 minutes until the sev- enth customer arrives? (a) 0.05 (b) 0.99 (c) 0,94 (d) 0.07

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