Binomial Distribution

G

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Guest
If ten coins are tossed 50 times, on how many occasions would we expect the number of heads to exceed the number of tails?

My working out:

n = 50

50C25*0.5^26*0.5^24

Is this right?
 
On any trial (which is flipping the 10 coins once), the probability of the number of heads exceeding the number of tails is 0.377. This is the same as determining the probability of 6 or more heads in 10 flips.

Since we repeat this 50 times, the expected number would be 50 * .377 = approx 19.
 
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