|ICinly about ?0% of all donated human blood can be used in hospitals. The remaining 30% cannot be used because of various infections in the blood. Suppose a blood bank has 10 newly donated pints of blood. Find the probability that: a) Two or fewer pints will be unusable. b) The number of unusable pints will be more than 5. c) The number of unusable pints will be exactly 5. d) The number of usable pints will be more than 4 but less than 8. e) All of the pints will be usable. f) None of the pints will be usable. g) Find the expected value of the usable pints. h) Find the standard deviation of the number of usable pints