Use the following information for questions 15-16 Every 5 years the Conference Board of the Mathematical Sciences surveys college math departments. [11 2010 the board reported that 51% of all undergraduates were in classes that used graphing calculators. Of those classes using graphing calculators, 32% required computer assignments. Of those classes not using graphing calculators, 15% required computer assignments. (Hint: draw a tree diagram) Dene events as follows: A: Graphing Calculator A: Not using Graphing Calculator B: Computer Assignment B\": Not requiring a Computer Assignment P(B|A) /' I> P (A and B) P (A) _ P03-c | A) ... P(A and BC) P (B | N) P (N) / _ I P (A: and B) Paar | At) _, Port and Br) 15. What percent of undergraduate students were in classes that required to do computer assignments in their classes? A. 0.47 B. 0.2367 C. 0.1632 D. 0.32 E. None ofthese 16. Given that undergraduate students had required computer assignments, what percent of classes use a graphing calculator? A. 01632 B. 0.32 C. 0.6895 D. 0.2367 E. None of these