Name Date Class MODULE Conditional Probability and Independence of Events 23 Module Quiz: Modified SHOW WORK WHENEVER CALCULATIONS ARE MADE This table shows different numbers of high At a school, the students in the band and school juniors and seniors and how they get chorus are from the freshman and sophomore to school. Use the table below to answer classes. This table shows how many students questions 1 and 2 in each ensemble are from each class. Let event A be choosing a student in the chorus Drive Bus Total and event B be choosing a freshman. Use the Junior 18 80 98 table below to answer questions 4-7. Senior 40 52 92 Band Chorus Total TOTAL 58 132 190 Freshman 42 14 56 1. To the nearest percent, what is the Sophomore 63 21 84 probability that a junior takes the bus to TOTAL 105 35 140 school? A 42% 4. What is P(A) rounded to the nearest percent? B 61% A 10% C 82% B 25% 2. To the nearest percent, what is the probability that a student who drives is a C 40% senior? 5. What is P(A | B)? A 21% A 10% B 43% B 25% C 69% 0 40% 3. In a standard deck of playing cards, what 6. Compare your answers to questions is the probability of randomly selecting a 4 and 5, and explain what this result red card with the number 5 on it? Round means. your answer to the nearest percent. A 4% B 6% 7. What is P(A) - P(B)? C 8%