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You are going to toss 2 pennies 20 times how many times do you expect the 2 pennies will come up as 2 heads?
5 times.
When tossing 2 pennies there are 4 equiprobable outcomes or events with 1/4 of
probability for each to happen:
P(H,H) = 1/4
P(H,T) = 1/4
P(T,H) = 1/4
P(T,T) = 1/4
So if you toss 2 pennies 20 times, the "expected" number of times that 2 heads (H,H)
will come up is 1/4 of the 20 times, that is 5 times.
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If you flip a coin 20 times how many times would you expect it to land on heads?
A fair coin would be expected to land on heads 10 times on average.
If you flipped a coin 150 times about how many times would you expect it to land on heads?
A fair coin would be expected to land on heads 75 times.
How many times would you expect the coin to land on heads if you flipped the coin 700 times?
Roughly half of the time, so about 350 times.
Suppose you have an extremely unfair coin the probability of a head is ¼ and the probability of a tail is ¾ If you toss the coin 32 times how many heads do you expect to see?
Expected number of heads is 1/4 * 32 or 8 heads.
Two coins are tossed 50 times how many times do you expect to get two heads?
This is a binomial probability distribution The probability of exactly 2 heads in 50 coin tosses of a fair coin is 1.08801856E-12. If you want to solve this for how many times 50 coin tosses it would take to equal 1 time for it to occur, take the reciprocal, which yields you would have to make 9.191019648E11 tosses of 50 times to get exactly 2 heads (this number is 919,101,964,800 or 919 billion times). If you assume 5 min for 50 tosses and 24 hr/day tossing the coin, it would take 8,743,360 years. That is the statistical analysis. As an engineer, looking at the above analysis, I would say it is almost impossible flipping the coin 50 times to get exactly 2 heads or I would not expect 2 heads on 50 coin tosses. So, to answer your question specifically, I would say none.
