Answer:
The probability that 3 out of 5 student select chocolate chip cookie is 2/5
Explanation:
The number of student in the sample = 5
The number of student that select the chocolate chip cookie = 3
The ratio of preference of chocolate to oatmeal = 2 to 1
Therefore, out of every 3 cookie, selected, 2 are chocolate while one is oatmeal
Which gives;
The probability that a cookie selected is chocolate = 2/3
The combined probability that 3 out of 5 student select chocolate chip cookie is therefore;
P(3 of 5 select chocolate chip cookie) = 3/5 × 2/3 = 6/15 = 2/5
The probability that 3 out of 5 student select chocolate chip cookie = 2/5.