# A total of 150 healthy females volunteered to take part in a multicenter study of a new urine…

A total of 150 healthy females volunteered to take part in a multicenter study of a new urine testing kit to determine pregnancy. One-half of the volunteers were pregnant, in their first trimester. Urinary pHs were recorded and 62 of the volunteers were found to have a urine pH less than 7.0 (acidic) at the time of the study. Also, 36 of these women with acidic urine were also pregnant.

If one volunteer is selected at random:

a. What is the probability the person is pregnant?

b. What is the probability the person has urine that is acidic (less than pH 7)?

c. What is the probability the person has a urine that is basic (pH equal to or greater than 7)?

d. What is the probability that the person is both pregnant and has urine that is acidic (less than pH 7)?

e. What is the probability that the person is either pregnant or has urine that is acidic (or less than pH 7)?

f. If one volunteer is selected at random from only those women with acidic urinary pHs, what is the probability that the person is also pregnant?

g. If one volunteer is selected at random from only the pregnant women, what is the probability that the person has a urine pH of 7.0 or greater?

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