(a) In a random sample of 186 children taken more than a decade ago, what is the probability that 50 or more had high blood-lead levels? (Round your answer to three decimal places.) (b) In a random sample of 186 children taken now, what is the probability that 50 or more have high blood-lead levels? (Round your answer to three decimal places.)

A recent survey showed that 65 adults out of a sample of 500 do not like cold weather. However, 84 of those studied said that they had interest in taking skiing lessons. Based on this sample, if an adult is chosen at random, what is the probability that he or she has no desire to take skiing lessons? Express your answer as a fraction in lowest terms or a decimal rounded to the nearest millionth.

Research has shown that approximately 1 woman in 500 carries a mutation of a particular gene. About 45% of women with this mutation develop bladder cancer. Find the probability that a randomly selected woman will carry the mutation of this gene and will develop bladder cancer. ... Sample Space: Women Women with mutated gene Women who develop bladder cancer The probability that a randomly selected woman will carry the gene mutation and develop bladder cancer is (Round to four decimal places as needed.)

According to a study on teenage shopping behavior, it was found that 75% of female teens regularly shop in stores rather than shopping online. If a group of 6 female teenagers are selected at random, what is the probability that at least 3 of them regularly do their shopping in stores? (Round your answer to four decimal places.)