Answer:
0.3788
Explanation:
12 people want to teach math at a college.
6 people have a PhD.
5 people have a master's degree.
boss wants to interview 5 people for the job.
chance that all 5 of the people interviewed have a PhD.
total number of ways to select 5 applicants out of 12 is given by the combination:
combinations formula :
nCr = n! / r! * (n – r)!
C(12, 5) = 12! / (5! * 7!) = 792
number of ways to select 3 applicants with a PhD out of the 6 available is:
C(6, 3) = 6! / (3! * 3!) = 20
remaining 2 applicants can be selected from the remaining 6 applicants with a master's degree:
C(6, 2) = 6! / (2! * 4!) = 15
total number of ways to select 5 applicants with 3 having a PhD is:
20 * 15 = 300
P(3 PhDs) = 300 / 792
P(3 PhDs) = 0.3788 (rounded to four decimal places)
So, the probability of selecting five applicants for an interview where all three applicants have a PhD is approximately 0.3788
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