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18 April, 08:00

A highway speed monitor is located on the side of the road that has a speed limit of 45 mph. The system records the speeds of passing vehicles. The data below shows the speeds of the first 9 cars that pass.

46 56 45 44 45 61 55 53 39

What is the standard deviation, to the nearest tenth, based on the posted speed limit, 45 mph?

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  1. 18 April, 09:40
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    You add 46+56+45+44+45+61+55+53+39 and you get 49.3333 rounded to the nearest tenth the standard deviation would be 49mph
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