John Beale of Standford CA recorded the speed of cars drivingpassed his house, w

Question

John Beale of Standford CA recorded the speed of cars drivingpassed his house, where the speed limit reads 20mph. The meanof 100 readings was 23.84 mph with a standard deviation of 3.56 mph(He actually recorded every car for two-month periods. These arerepresentative readings.) 1. How many standard deviation from the mean would a cargoing unde the spead limit be? 2. Which would be more unusual, a car traveling 34 mphor one goig 10 mph? John Beale of Standford CA recorded the speed of cars drivingpassed his house, where the speed limit reads 20mph. The meanof 100 readings was 23.84 mph with a standard deviation of 3.56 mph(He actually recorded every car for two-month periods. These arerepresentative readings.) 1. How many standard deviation from the mean would a cargoing unde the spead limit be? 2. Which would be more unusual, a car traveling 34 mphor one goig 10 mph?

Explanation / Answer

1) We need to calculate the 2 limits i.e. ±2 =23.84±2(3.56) =(16.92,30.96). There are 2 standard deviations from the mean would a car goingunder the speed limit would be. 2) A car traveling 34 mph would be more unusual.

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