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On average, you receive 2 telemarketing calls per day. What is the probability that you will not receive any telemarketing calls today.

There is 0.4 probability that you will not receive a telemarketing phone call in one day. What is the expected number of telemarketing calls you will receive per day? What assumption do you make about the distribution?

The ABC company makes an electric appliance. The life of this appliance has a normal distribution with a mean of 72 months and a standard deviation of 9 months. The ABC company is to determine the warranty period of this appliance. If the appliance breaks down during the warranty period, the company will replace it free of charge. What should the warranty period be if the company does not want to replace more than 3% of the appliance?

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