The probability that a customer at a bank wants to have a document notarized is

Question

The probability that a customer at a bank wants to have a document notarized is 0.021. Assume that such requests are independent. Give the probability mass function for the number of customers until the first request to have a document notarized 1. 2. The number of errors in a textbook follows a Poisson distribution with a mean of 0.01 errors per page. What is the probability that there are three or fewer errors in 100 pages? 3. A student guesses on a true-false exam, that is, the student says "true" with probability 0.5 and "false" with probability 0.5. If the exam has 10 questions, what is the probability the student gets at least 7 questions correct? 4.There are 10 box lunches on a table; 5 are turkey and 5 are tuna, but they aren't labeled. If I take 4 at random, what is the probability I get 1 tuna and 3 turkey lunches?

Explanation / Answer

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4) n = 10

5 turkey and 5 tuna

Take 4 at random

P = 5C1 * 5C3/10C4

P = 0.24

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