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18/20 x 17/19 x 16/18 = 4896/6840, or around 71.6%.

Q: In a shop there are 20 customers 18 of whom will make a purchase If three customers are selected one at a time at random what is the probability that all will make a purchase?

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Here is another way to phrase the question: If 18 out of 20 customers make a purchase in a shop, and three customers are selected at random, what is the probablity that all will make a purchase? Each random customer has a 18/20 chance of being one that purchased, so the probability that all three make a purchase is 18/20*18/20*18/20=.729

probability = 2/7 to be exact, 28/97 (about 28.87%)

Approx 0.0287

6 out of 30 ie 20% or 0.2

There is only one girl out of 12 students so the probability that the girl is selected is 1/12.

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Here is another way to phrase the question: If 18 out of 20 customers make a purchase in a shop, and three customers are selected at random, what is the probablity that all will make a purchase? Each random customer has a 18/20 chance of being one that purchased, so the probability that all three make a purchase is 18/20*18/20*18/20=.729

The probability is 10 percent.

1/365 = 0.00274

It depends on what the random variable is, what its domain is, what its probability distribution function is. The probability that a randomly selected random variable has a value between 40 and 60 is probably quite close to zero.

probability = 2/7 to be exact, 28/97 (about 28.87%)

.4032

random sample

When each member of the population has the same probability of being selected as a member of the sample.

The probability is approx 0.81

It is a simple random sample.

This is called a random sample.

Simple random sampling.