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Use the following information for Exercises 15–18. Suppose the mean blood sugar level is 100 mg/dl (milligrams per deciliter), with a standard deviation of 10 mg/dl.

Question 3.272

17. Chelsea has a blood sugar level of 125 mg/dl.

  1. If we calculate Chelsea's z-score, what is the scale?
  2. Calculate Chelsea's z-score.
  3. Interpret her z-score.

3.4.17

(a) The standard deviation, which is 10 mg/dl. (b) 2.5 (c) Chelsea's blood sugar level lies 2.5 standard deviations above the mean blood sugar level of 100 mg/dl.

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