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Statistics

John drives to work each morning and the trip takes an average of μ = 38 minutes.
The distribution of driving times is approximately normal with a standard deviation of σ = 5
minutes. For a randomly selected morning, what is the probability that John’s drive to work
will take less than 35 minutes?

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  1. Use z-scores.

    z = (x - mean)/sd

    With your data:

    z = (35 - 38)/5

    Finish the calculation, then check a z-table for the probability of less than 35 minutes using the z-score.

    I hope this will help get you started.

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  2. 500

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  3. p=0.2743

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  4. -0.6---> z-score = 0.2743

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