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Seven coins are tossed What is the probability of 3 heads or 2 tails?
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Answered 2011-09-26 13:43:04
The probability of one event or the other occurring is the probability of one plus the probability of the other. The probability of getting 3 heads is the probability of 3 heads (1/23) multiplied by the probability of 4 tails (1/24) multiplied by the number of possible ways this could happen. This is 7c3 or 35. Thus the probability of 3 heads is 0.2734375. The probability of 2 tails is the probability of 2 tails (1/22) multiplied by the probability of 5 heads (1/25) multiplied by the number of ways this could happen. That is 7c5 or 21. Thus the probability of 2 tails is 0.1640625
The probability of one or the other is the sum of their probabilities:
0.1640625 + 0.2734375 = 0.4375
Thus the probability of getting 3 heads or 2 tails is 0.4375.
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What is probability of getting all heads if 3 coins are tossed simultaneously?
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Whats the probability of getting at most one heads when two fair coins are tossed?
When two fair coins are tossed, you have the following possible outcomes: HH, HT, TH, TT. So, at most implies that you get either i) zero heads or ii) one head. From the possible outcomes we see that 3 times we satisify the outcome. Thus, probability of at most one head is 3/4.
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What is the probability of tossing seven coins and getting 6 heads?
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lets get some facts odds of head on 1 coin 50% or evens odds of no head 50% or evens the possible results vary from 1 coin to 2 coins. 1 coin has 2 results heads or tails 2 coins have 4 results. heads heads, tails tails, tails heads, heads tails. each outcome has a probability of 25%. for the question we remove the heads and tail probability and we have 2 outcomes with heads and one without. so 2 to 1 chance or 33.3333 recuring chance.
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What is the probability of getting exactly 2 heads by flipping 3 coins?
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If a coin is tossed 3 times what is the probability of 3 heads?
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What is the probability that at least one tail appears when tossed 6 times?
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What is the probability of tossing four coins and getting four heads if the first two tosses are heads?
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What is the probability of obtaining exactly six heads in seven flips of a coin given that at least one is a head?
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