The probability that a 20-year-old female will survive the next
year is 0.999544. An insurance company takes a random sample of 50
females who are 20 years old. Let XX be the number of
people in the sample who are still alive 1 year later. a.Find the
probability that exactly 49 survive. b.Find the probability that
the number who survive is between 40 and 48, inclusive. c.Find the
probability that at least one person will not
survive. d.Find the expected number who will survive. (In other
words, find the mean of XX.)