PLEASE HELP 30 POINTS Suppose a student takes a multiple-choice exam containing 100 questions. The first 60 questions have 5 choices each and the second 40 have 4 choices each. Assume the student selects his or her answer to each question randomly. What is the standard deviation of the total number of questions answered correctly by this method? Round to the nearest tenth.

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accelerated heartbeat, raise in blood pressure, slow in digestion, raise in blood sugar and perspiration. (myers' psychology for ap 2nd edition pg 87)