In: Math
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. The numbers in the Table below represent the number of groups of dolphins that took part in an activity at certain times of days. In Excel
Activity |
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)
required probability = 39/189 =13/63
b)
required probability = 72/189 = 8/21
c)
P(travel | morning) = 6/72 = 1/12
d)
P(morning | socializing) = 38/62 = 19/31
e)
P(afternoon | feeding) = 0
f)
P(evening or feeding) = (79+88-56)/189=111/189 = 37/63