Lesson #8 answers

In-class exercise answers:


  1. 36 students were polled.


    1. How many like rock music only? 18
    2. How many like all types of music? 7
    3. How many like rock and rap but not country? 11
    4. How many like Country music? 33
    5. How many like Rock and Country, but not Rap? 8
    6. How many students were polled? 86




  2. 74 students were surveyed.

Homework answers:


    1. How many homes do not have cable tv?
      100 - 25 - 56 = 19
    2. How many homes have neither cable tv or internet?
      100 - 25 - 56 - 9 = 10
    3. How many have internet but not cable tv? 9


  1. What is the total number of students polled? 36
  2. What is the probability that a randomly selected student likes both? 12/36 = 1/3

  1. 2 students don't like either subject!
    1. How many students liked ketchup only? 20
    2. How many liked either mustard or ketchup but not relish?
      20 + 8 + 13 = 41
    3. How many were vegetarians
      and didn't like any of the choices? 7
    4. How many liked all 3 condiments on their burger? 5
    5. How many like relish on their burger? 22
    6. How many liked mustard on their burger? 28
    7. How many liked ketchup on their burger? 39
    8. How many students were polled? 63


  3. Out of 57 students there are (10 + 5 + 1 + 2) 18 cat owners, so the probability is 18/57 = 31.6%