Assign your numbers for mean ? and standard deviation ?.
Then select a number "A" below mean ?, and a number "B" above mean ?.

Use Appendix Table for the Normal Distribution to find probability that x is between A and B: P (A < x < B).

Here are steps to follow:
convert A to z score (let's call it za),
convert B to z score (let's call it zb).;
From Appendix table for Normal Distribution (attached)
find area under curve to the left of za and to the left of zb.
That will give you P (z < za) and P (z < zb).
If za or zb are not in the table, change your A or B.
Finally, apply formula:
P (A < x < B) = P (za < z < zb) = P (z < zb) - P (z < za)

Make an example from real situation where this technique can be applied.

Answer rating: 100% (QA)

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