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1. The sales records of a real estate agency show the following dailysales over the past...

1. The sales records of a real estate agency show the following dailysales over the past 200 days. Convert this frequency table into an empirical probability distribution, then answer the question: What is the maximum usual number of houses sold in one day? Round your answer to two decimal places.

Houses sold : 0,1,2,3,4

Number of days: 50,87,43,15,5

2. Find the standard deviation of the probability distribution for the random variable x, which represents the number of cars per household in a small town. Round your answer to three decimal places.

x : 0,1,2,3,4

P(x) : .125, .428, .256, .108, .083

3. Find the standard deviation of the given probability distribution. Round your answer to one decimal place. The probabilities that a batch of 4 computers will contain 0, 1, 2, 3, and 4 defective computers are 0.6561, 0.2916, 0.0486, 0.0036, and 0.0001, respectively. Find the value of σ.

Math   Statistics-And-Probability   
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