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nevsk [136]
3 years ago
14

The probability that a person will have 0, 1, or 2 dental checkups per year is 0.3, 0.6, and 0.1, respectively. If seven people

are picked at random, what is the probability that two will have no checkups, four will have one checkup, and one will have two checkups in the next year?
A) 0.012
B) 0.122
C) 0.588
D) 0.018
Mathematics
1 answer:
Tom [10]3 years ago
3 0
<h2>The required probability is 0.1224.</h2>

Step-by-step explanation:

Here, given:

The probability of having 0 dental checkup = 0.3

The probability of having 1 dental checkup = 0.6

The probability of having 2 dental checkup = 0.1

Number of people chosen at random  = 7

So, the number of ways 2, 4 and 1 checkup are :  (\frac{7!}{2! \times 4!  \times 1!} )

Now, the combined probability  that two will have no checkups, four will have one checkup, and one will have two checkups in the next year

= (\frac{7!}{2! \times 4!  \times 1!} ) \times (0.3)^2 \times (0.6)^4 \times (0.1)^1  =  0.1224

Hence, the required probability is 0.1224.

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