3. Grace claims, “the probability of rolling a sumof 12 when you roll two dice i

Question

3. Grace claims, “the probability of rolling a sumof 12 when you roll two dice is 1/11 , because two dice have sums 2through 12 which means there are 11 possible sums.” Howdo you respond?

4. If the median is greater than the mean on a set of testscores, describe the distribution.

5. (a) The mean age of members of a class reunionwas 71.9. The next year the mean age was 71.5 years. How can the mean age decrease when all class members are a yearolder?

     (b) The mean age of ten people ina room is 15 years. A 50-year-old person walks in. How much is the mean increased?

Explanation / Answer

4. the distribution is left-skewed
5. a. some of the old fogies died, and the ones who died werethe older members of the class    b. 10*15+50 = 200, 200/11 = 18.2, 18.2-15 =3.2

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