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What is the probability that 4 randomly selected people all have different birthdays?
Let us assume that there are exactly 365 days in a year and that birthdays are uniformly randomly distributed across those days.
First, what is the probability that 2 randomly selected people have different birthdays? The second person's birthday can be any day except the first person's, so the probability is 364/365.
What is the probability that 3 people will all have different birthdays? We already know that there is a 364/365 chance that the first two will have different birthdays. The third person must have a birthday that is different from the first two: the probability of this happening is 363/365. We need to multiply the probabilities since the events are independent; the answer for 3 people is thus 364/365 × 363/365.
You should now be able to solve it for 4 people.
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What is non-probability sampling?
Non probability sampling is where the samples are not selected randomly.
What is the probability that a randomly selected person will be both over 50 and female?
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.
What is the probability that a randomly selected man between age 55 and 64 does not have this disease?
The answer will depend on what the disease is.
You randomly select 500 students and observe that 85 of them smoke Estimate the probability that a randomly selected student smokes?
85/500 = 17%
Must randomly select 5 people out of 26 what is the probability that the 5 youngest are selected?
It is approx 0.001824
What is non-probability sampling?
Non probability sampling is where the samples are not selected randomly.
What is the probability that a randomly selected person will be both over 50 and female?
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.
What is the probability that a randomly selected date in one year is not in the month of December and januray?
10/12
What is the probability that a randomly selected man between age 55 and 64 does not have this disease?
The answer will depend on what the disease is.
If a point is randomly selected from the colored area of the graph what is the probability that it will NOT be in the red region?
15 19
You randomly select 500 students and observe that 85 of them smoke Estimate the probability that a randomly selected student smokes?
85/500 = 17%
The probability of a person getting a cold is .7 What is the probability that 4 people if selected randomly will get a cold?
If the events can be considered independent then the probability is (0.7)4 = 0.24 approx.
Must randomly select 5 people out of 26 what is the probability that the 5 youngest are selected?
It is approx 0.001824
What is the probability that a randomly selected case from a normally distributed distribution will have a score between -1.00 and the mean?
The answer is 0.1586
What is the probability that one randomly-selected person in America will know another randomly-selected person in America?
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".
Find the probability of three products randomly selected are acceptable from a production where 70 percent where acceptable?
It is 0.73 = 0.343
What is the probability that 20 substandard welds will be found out of 300 randomly selected samples knowing that 5 percent will be substandard?
Using the Poisson approximation, the probability is 0.0418
