3. An unfair coin is tossed seven times. This coin is weighted to come up heads 3/5 of the time. You must do this problem by hand and show the work. If you wish, you may check your answer with the TI-84. Round to 4 decimal places. a. Find the probability that it will come up heads exactly five times. b. Find the probability that it will come up heads at most twice. c. Find the probability that it will come up heads more than five times. I