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This might be a simple question, but can anyone tell me how to solve it.

The probability of success of a particular type of experiment is 0.004. How many times the same experiment is to be repeated so that the probability of success becomes more than 0.7??

Is it simply, 0.004 * x = 0.7 and then find x which is 175

or

(0.996)^x * (0.004) implies where x = 731.

I did not understand how to approach this problem...

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    I suppose the word 'success' has two different meanings in your question. Do you mean: "How many times the same experiment has to be repeated so that the probability of _at least one success occurring_ becomes more than 0.7?" Edit: if so, see Gerry Myerson's answer.2012-09-09

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