A market researcher at a major automobile company classified households by car ownership. The relative frequencies of households for each category of ownership are shown below: Number of cars per household Relative frequency 0 0.10 1 0.30 2 0.40 3 0.12 4 0.06 5 0.02 Calculate the expected value and standard deviation of the random variable and interpret the result.

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A market researcher at a major automobile company classified households by 
car ownership. The relative frequencies of households for each category of 
ownership are shown below:

Number of cars per household                            Relative   frequency
                 0                                                                  0.10
                 1                                                                  0.30
                 2                                                                  0.40
                 3                                                                  0.12
                 4                                                                  0.06
                 5                                                                  0.02

Calculate the expected value and standard deviation of the random variable and interpret the result. 

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