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Researchers watched groups of dolphins off the coast of Ireland in 1998 to determine what
activities the dolphins partake in at certain times of the day ("Activities of dolphin," 2013). The
numbers in table #4.3.3 represent the number of groups of dolphins that were partaking in an
activity at certain times of days.
Table #4.3.3: Dolphin Activity
Activity Period
Morning Noon. Afternoon. Evening Total
Travel 6. 6 14 13. 39
Feed 28 4. 0 56 88
Social 38 5 9 10 62
Total 72 15 23 79 189
a) What is the probability that a dolphin group is being watched in the evening and is partaking
in feeding?
b) What is the probability that a dolphin group is being watched in the afternoon or is partaking
in feeding?
c) What is the probability that a dolphin group is partaking in travel given that it is morning?
d) What is the probability that a dolphin group is being watched in the afternoon given that it is
partaking in socializing?
e) Are there any mutually exclusive events? Which ones (if any) and why?
f) Which activity events are independent from being observed at noon?Which ones are
dependent? Please justify your answer(s).

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