A door-to-door sales person for a household appliance has


A door-to-door sales person for a Household appliance has learned from her past experience that out of twenty demonstrations of her appliance only seven result in actual sales (long run average). This week she needs to make at least four sales. At least how many demonstrations does she need to perform to ensure that the probability of meeting her target is at least 95 percent?

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Basic Statistics: A door-to-door sales person for a household appliance has
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