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What are the chances of throwing heads on a coin 100 times?

The answer is actually 1 in 1267650600228229401496703205376 or stated more neatly, 1 in 2100 . These answers assume, of course, that the questioner means 100 consecutive times.


In a twenty question true false examination a student must achieve eight correct answers to pass if student answers randomly what is the probability that student will fail?

The probability this student will fail is the same as the probability that some other student will flip a fair coin 20 times and get less than 8 heads, i.e., more than 12 tails. There are 2^20 possible different-looking sequences of 20 coinflips, which we assume all have equal probability. Of those sequences, 1 has no heads at all, 20 have exactly 1 head, 190 have exactly 2 heads, ... and 77520 have exactly 7 heads. So we sum up all those possible ways to fail and we get ... ... ... I'm assuming that the student answers randomly, flipping a fair (50:50) coin on each question to choose "true" or "false". In that special case, it doesn't matter how many of those twenty questions are true or how many are false. (If the student answers randomly by flipping an unfair coin, say a 25:75 coin, then it does matter how many of those questions are true -- I'll let you figure that one out).


What is this coin worth it has Arabic writing and looks like a two pound coin?

I suggest you get a good coin book and search for your coin in there.


How do you get a coin graded?

The most expeditious way to get a coin graded is to locate a coin shop nearby - present the coin to the owner for grading. If he/she is uncomfortable to do so, he/she will refer you to a numismatist (experienced coin collector).


What is an experiment in math?

There are many different types of mathematical experiments in math, but the most easy one I can think of would be the Experimental Probability. Example: Flipping a coin and recording your answers to see the actual probability of landing on heads or tails.

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