Question

Judy's Doctor is concerned that she may suffer from hypokalemia (low potassium in the blood). There is variation both in the actual potassium level and in the blood test that measures the level. Judy's measured potassium level varies according to the Normal distribution with a mean of 3.8 and a standard deviation 0.2. A patient is classified as hypokalemic if the potassium level is below 3.5.

If measurements are made on four (4) separate days, and the mean result is compared with the criterion of 3.5, what is the probability that Judy will be diagnosed as hypokalemic?

For this question, please upload the image of the normal curve with the appropriate area shaded, include the calculator command used.

*I need to know how to enter this into a TI-83 or 84 calculator. I also need the curve sketched.*

Answer 1