1.-Statistical exam scores are normally distributed with mean of 85…
Question Answered step-by-step 1.-Statistical exam scores are normally distributed with mean of 85… 1.-Statistical exam scores are normally distributed withmean of 85 and standard deviation 7 . What fraction of the ratings is foundbetween 60 and 70? 2.-In a community of 300 people, 110 have children, 120 are employed. If there are 80people who do not have children and who do not have a job:1) Prepare the contingency tableb) If a bachelor is selected at random. What is the probability that you are an entrepreneur? 3.-Assume that male and female births are equally likely and thatthe birth of any baby does not affect the likelihood of the gender of any otherbaby. Calculate the probability that exactly 5 girls will be born in 15 births. 4.-Let X be the survival time, in days, of guinea pigs exposed to agamma radiation of 300 rads (absorbed radiation dose). X is supposed to followa gamma distribution with parameters a = 9 and ß = 18a)Calculate the mean and variance of survival.b)Calculate the probability that a rabbit will survive between 80 and 120 days. 5.-The time in years it takes for a radioactive substance to degrade is distributedexponentially with the density function What is the probability that the time it takes to degrade is more than 8 years? Math Statistics and Probability ESTADISTIC APLICADA Share QuestionEmailCopy link Comments (0)
