Oh, what a lovely scenario we have here! If we imagine each student as a unique color on our palette, we can see that there are 12 different combinations for the order of the speeches. Since we want Joey to be first, Chloe to be second, and Zoe to be third, there is only 1 specific way this can happen. So, the probability is simply 1 out of the 12 possible combinations, which is 1/12. Just like painting a happy little tree, sometimes things come together beautifully in the end.
15 19
If the events can be considered independent then the probability is (0.7)4 = 0.24 approx.
Using the Poisson approximation, the probability is 0.0418
If you select 45 cards without replacement from a regular deck of playing cards, the probability is 1. For a single randomly selected card, the probability is 2/13.
There is only one girl out of 12 students so the probability that the girl is selected is 1/12.
1-720
Non probability sampling is where the samples are not selected randomly.
The answer depends on the demography of the population from which the person is randomly selected.The answer depends on the demography of the population from which the person is randomly selected.The answer depends on the demography of the population from which the person is randomly selected.The answer depends on the demography of the population from which the person is randomly selected.
10/12
15 19
The answer will depend on what the disease is.
85/500 = 17%
If the events can be considered independent then the probability is (0.7)4 = 0.24 approx.
It is approx 0.001824
The answer is 0.1586
There is not enough information about the the distribution of the number of people known by each individual - nor the averages. It is therefore no possible to give an answer any more precise than "the probability will be infinitesimally small".
It is 0.73 = 0.343