A person's blood glucose level and diabetes are closely related. Let *x* be a random variable measured in milligrams of glucose per deciliter (1/10 of a liter) of blood. Suppose that after a 12-hour fast, the random variable *x* will have a distribution that is approximately normal with meanμ = 82 and standard deviation σ = 20. *Note:* After 50 years of age, both the mean and standard deviation tend to increase. For an adult (under 50) after a 12-hour fast, find the following probabilities. (Round your answers to four decimal places.)

(a) *x* is more than 60

(b) *x* is less than 110

(c) *x* is between 60 and 110

(d) *x* is greater than 140 (borderline diabetes starts at 140)

#### Top Answer

) μ = 87 σ = 27 standardize x to z = (x - μ) / σ P(x > 60) = P( z > (60-87) / 27) = P(z > -1) = 0.8413 (From... View the full answer

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#### Other Answers

a) Z = 60 -82 /20 = -1.1 P(Z>-1.1) = 0.8643 b) Z = 110 -82 /20 = 1.4... View the full answer

a) P(X > 60) = P(Z > (60-82)/20) = P(Z > -1.1) = 1- P(Z<-1.1) = 1 - 0.1357 = 0.8643 b)... View the full answer