A census was conducted at a school. All of the students were asked how many cars their family owns. The results are below.

Pag

Question

Number of Cars

0

1

2

3

4

Probability

0.005 0.120 0.125 0.500 0.250

For the questions below enter the value only. Round to the nearest hundredth, if necessary

1. What is the probability that a randomly chosen student has 4 cars? 0.250

2. What is the probability that a randomly chosen student has less than 2 cars?

0.125

3. What is the probability that a randomly chosen student has at least 3 cars? 0.75

4. What is the expected number of cars? 2.87

5. What is the standard deviation? 0.17

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