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A random sample of 20 cars was selected. The following table shows the number of cars grouped by age in years. Table of age

A random sample of 20 cars was selected. The following table shows the number of cars grouped by age in years. Table of age in years versus number of cars Age in Years 0 to under 4 4 to under 8 8 to under 12 12 to under 16 Number of Cars 7 2 8 3 What is the approximate standard deviation for the age of cars from this sample?

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