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September 19, 2014

September 19, 2014

Posted by **Robbie** on Sunday, October 14, 2012 at 12:07am.

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?

- Statistics -
**MathGuru**, Monday, October 15, 2012 at 8:30pmUse 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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