Melissa Ferreiro - D1

89 People surveyed believed in at least one of these things.
29 UFOs only +
30 Ghosts only +
13 Bigfoot only +
4 Ghosts & Bigfoot +
2 Bigfoot & UFOs +
9 UFOs & ghosts +
2 all three =
89 people who belived in at least one.
Total people surveyed 160 - 89 = 71 people who did NOT believe in any of the three.

The answer to the discussion question of how many people sureyed believed in at least one of these things is 89 people.