Suppose x has a distribution with u = 12 and o = 7. (a) If a random sample of size n = 45 is drawn, find uy, ox and P(12 < x < 14). (Round , to two decimal places and the probability to four decimal places.) 阪= Ox = P(12 < x< 14) = (b) If a random sample of size n = 60 is drawn, find ux, o y and P(12

Suppose that the contagious period of COVID-20 has an average of 7 days, and follows a chi-square distribution.  Let X measure the contagious period for a randomly selected specimen of the COVID-20 virus. State the distribution of the random variable X. Group of answer choices X∼χ2(6) X∼Student′st(7) X∼χ2(7) X∼Continuous(7)     A friend of yours has COVID-20 and the doctors have told her that she has had it for 10 days.  Compute the probability that they are still contagious.  (I.E. compute the probability that X is greater than or equal to 10 days.)