The Student Room Group

Probablilty

I have 10 coins. I spin them all at the same time and count the number of heads I have. If i do this 1000 times, how many times would I expect to see ten heads?

The answer is once..

How do you possibly work this out? Im not good with probability so I would appreciate it if someone explained in as much detail as possible please.
What's the probability of seeing one head? Then work out the probability of seeing 10 heads?
Hint:

Spoiler

Then you times that probability by the number of times you do it, to see the expected value.
Thank you so much
Original post by BobBobson
What's the probability of seeing one head? Then work out the probability of seeing 10 heads?
Hint:

Spoiler

Then you times that probability by the number of times you do it, to see the expected value.

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