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In: Statistics and Probability

4) Blood calcium levels are measured in mg/dL. In a group of patients over 30 you...

4) Blood calcium levels are measured in mg/dL. In a group of patients over 30 you find the following: μ = 9.3 mg/dL, and σ = 2.35 mg/dL.

a) Give the blood calcium values for the middle 50% of patients.

(Hint/comment: if you want the middle 50%, how many percent go in each tail?)

b) Give the blood calcium values for the middle 70% of patients. c) Give the 85th percentile.

d) Are you surprised by the answers to (b) and (c)? Explain. If you're not sure what's going on, draw some pictures of the normal curves.

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