Math Is Fun Forum

Anuj Naru

Member

Registered: 2016-02-20

Posts: 2

probability

The question was "Two coins are tossed once. What is the Probability of getting 2 heads?" in my Formative Exam. Can anyone tell me the answer along with the solution? As soon as possible.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: probability

It does not matter whether they are tossed two at once or one at a time. One outcome does not affect the other. We can just multiply the probabilities.

P( Two heads in 2 tosses) = (1/2)(1/2) = 1 / 4

I almost died today ( according to the metorologists... Is that even a science or is it just a bunch of guys guessing? ) so how about a little jargon?

When one outcome does not affect the other like two coin tosses we say they are independent.  The following law holds;

When two events, A and B, are independent, the probability of both occurring is:

P(A and B) = P(A) x P(B)

Welcome to the forum.

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