Tiki003

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The probability of a woman developing breast cancer over a lifetime is ~ 1/9. Suppose 27 women over the age of 21 are selected at random and followed over the course of their respective lifetimes. What is the probability that: no woman will develop breast cancer? at least one woman will develop breast cancer? more than 3 will develop breast cancer? what is the expected value – the arithmetic mean – of the number of women who will develop cancer?

probabilty maths

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Why is it when you minus X from both sides, it ends up with -X+6? aren't you subtracting it? Thanks!

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