# Question

After watching a number of children playing games at a video arcade, a statistics practitioner estimated the following probability distribution of X, the number of games per visit.

a. What is the probability that a child will play more than four games?

b. What is the probability that a child will play at least twogames?

a. What is the probability that a child will play more than four games?

b. What is the probability that a child will play at least twogames?

## Answer to relevant Questions

Refer to Exercise 7.23. Suppose that each game costs the player 25 cents. Use the laws of expected value and variance to determine the expected value and variance of the amount of money the arcade takes in.A shopping mall estimates the probability distribution of the number of stores mall customers actually enter, as shown in the table.Find the mean and standard deviation of the number of storesentered.Refer to Exercise 7.38. Further analysis by the manager revealed that the cost of processing each page of a fax is $.25. Determine the mean and variance of the cost per fax.Why are the seasons on Uranus different from the seasons on any other planet? Refer to Exercise 7.63. Compute the expected value and standard deviation of the portfolio composed of 30% stock 1 and 70% stock 2.An investor is given the following information about the returns on twostocks:Post your question

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