STATISTC 515 Midterm: STAT 515 UMass Amherst STAT515Fall2015Mid2Soln
Document Summary
In problems that require reasoning, algebraic calculation, or the use of your graphing calculator, it is not su cient just to write the answers. Suppose there is a room with 35 people in it, nd the probability that at least two people have the same birthday. (b) a fair coin is tossed 9 times. What is the probability that: exactly 3 heads appear, at least two heads appear, suppose that 2 dice thrown are thrown and the number, n, of dots showing is noted. Then suppose n coins are tossed, what is the expected value of the number of heads: (a) a quiz cosists of 10 multiple-choice questions of equal weight, each with 4 possible an- swers. For someone who makes random guesses for all of the answers, nd the probability of passing if the minimum passing grade is 70 %. (b) a fair die is rolled 10 times.
