Suppose that the speed at which cars go on the freeway is normally distributed with mean...

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Suppose that the speed at which cars go on the freeway is normally distributed with mean...

Suppose that the speed at which cars go on the freeway is normally distributed with mean 70 mph and standard deviation 8 miles per hour. Let X be the speed for a randomly selected car. Round all answers to 4 decimal places where possible.

1. If one of the cars is randomly chosen, find the probability that it is traveling between 69 and 73 mph.

math Statistics-And-Probability

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Answer 1

Answer #1

Use normalcdf function in TI 84 calculator

[2nd button --> DISTR --> normalcdf]

put the following values

lower = 69, upper = 73, mean = 70 and standard deviation = 8

this gives us

P(69<X<73) = normalcdf(69,73,70,8)

or

P(69<X<73) = 0.1959

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Answer 2

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Suppose that the speed at which cars go on the freeway is normally distributed with mean...

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