Kenny VaipheiExplainer

# How many heads do you expect her to have when she is finished all 200 tosses?

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## Expected Number of Heads after 200 Tosses

Since the coin is fair, the probability of getting heads on each toss is 0.5. Over 200 tosses, the expected number of heads is:

200 tosses × 0.5 = 100 headsHowever, you’ve already observed 15 heads in the first 20 tosses. This leaves 180 tosses remaining. For these remaining tosses, the expected number of heads is:

180 tosses × 0.5 = 90 headsThus, the total expected number of heads after all 200 tosses is:

15 (from the first 20 tosses) + 90 (from the remaining 180 tosses) = 105 heads