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Sorry if its too easy for you guys.

I need to generate few numbers which will be around 20% of all the numbers generated. I am guessing if i can generate random number between 1 to 100. But in that case whats the probability of getting a random number which will be less than 20 in between 1 and 100.

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    I think it pretty much depends on the probabilistic distribution, *e.g.*, uniform, normal, etc., you use to generate the set of random numbers in the first place. – 2017-02-20
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    Do you mean a pseudo-random number? There are many algorithms to provide those. https://en.wikipedia.org/wiki/Pseudorandom_number_generator. If on the other hand you want a truly random number, it's not clear whether there is any such thing. A pseudo-random number generator will have a 1/5 probability of generating a number between 1 and 20 out of a range of 1 to 100, if it's any good. – 2017-02-20
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    [Coin throws will yield truly random numbers](https://arxiv.org/abs/1212.0953) – 2017-02-20
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    I want to use rand() function of php. – 2017-02-20
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    you want to generate one number from 1 to 100 such that some of the numbers must be with 5% probability? – 2017-02-20
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    I don't understand exactly what is being asked here. Please state the question more clearly. – 2017-02-20
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    Whats the probability of getting a number which will be less than 20 if i try to pick up any numbers between 1 to 100 @Math1000 – 2017-02-20
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    20/100, give or take, assuming uniform distributions. Is this your question? – 2017-02-20
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    Are you just interested in integers? – 2017-02-20

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