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How many times must a man toss a fair coin, so that the probability of having at least one head is more than 80%?
cbse
class12
modelpaper
2011
sec-b
q22
math
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Dec 29, 2012
by
thanvigandhi_1
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How many times must a man toss a fair coin so that the probability of having at least one head is more than 90%?
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A bag contains (2n+1) coins.It is known that n of these coins have a head on both sides where as the rest of the coins are fair.A coin is picked up at random from the bag and is tossed.If the probability that the toss results in a head is $\Large \frac{31}{42}$,determine the value of n.
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A fair coin is tossed four times and a person win Rs.1 for each head and lose Rs.1.50 for each tail that turns up.From the sample space,calculate how many different amounts of money you can have after four tosses and the probability of having each of these amounts.
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In a class, having 60% boys, 5% of the boys and 10% of the girls have an I.Q. of more than 150. A student is selected at random and found to have an I.Q. of more than 150. Find the probability that the selected student is a boy.
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Jan 4, 2013
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