an article reported that patients under care for hiv have cd4 tests every 3 months on average, with a standard deviation of 1.5 months. assume that the distribution of time between tests is normal. (a) what is the probability that a randomly selected patient under care for hiv waits between 2 and 3 months to have a cd4 test? the probability that a randomly selected patient under care for hiv waits between 2 and 3 months to have a cd4 test is . (b) what is the probability that a randomly selected group of 20 patients under care for hiv have a mean wait time of greater than 2.5 months to have cd4 tests? the probability that a randomly selected group of 20 patients under care for hiv have a mean wait time of greater than 2.5 months to have cd4 tests is .



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