SOLUTION: The average speed limit in the USA is 25 mph with a standard deviation of 2.4 mph. What is the probability that a speed limit in the USA is greater than 20 mph?

Question 1198115: The average speed limit in the USA is 25 mph with a standard deviation of 2.4 mph. What is the probability that a speed limit in the USA is greater than 20 mph?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!


Hi  
Normal Distribution: µ = 25 and σ = 2.4  

Using TI or similarly an inexpensive calculator like an Casio fx-115 ES plus
p(x > 20) = normcdf(20,9999,2.4,25) = .9814

Important You are comfortable using Your calculator
Wish You the Best in your Studies.

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