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September 17, 2014

September 17, 2014

Posted by **Jerome** on Sunday, June 23, 2013 at 5:00pm.

What is the probability that the mean fuel cost is between $2.84 and $2.86?

- Statistics -
**MathGuru**, Sunday, June 23, 2013 at 6:43pmUse z-scores.

Formula for this problem:

z = (x - mean)/(sd/√n)

Find two z-scores, using 2.84 for x and also 2.86 for x. Mean = 2.835 and sd = 0.15. Sample size n = 100.

Once you find the two z-scores, use a z-distribution table to determine your probability between the two z-scores.

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