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The speed of cars driving past our house were recorded and the speed limit was 20 mph the mean of 100 readings was 23.84 mph

The speed of cars driving past our house were recorded and the speed limit was 20 mph the mean of 100 readings was 23.84 mph with a standard deviation of 3.56 mph how many standard deviations from the mean what a car going under the speed limit be

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