1. An orange orchard claims that only 4% of its oranges have brown spot. The oranges are sold in lots of 2000. The orchard agrees to take back any lot that contains more than 80 oranges with brown spot. Calculate the probability that any given lot is returned. (3 marks) 2. The number of organisms in a 600 ml milk bottle before sterilisation follows a Poisson distribution with a mean of 25. . Calculate the probability that there are between 20 and 26 organisms inclusive in a randomly selected milk bottle before sterilisation