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Find the mean number of heads in three tosses of a fair coin.
cbse
class12
modelpaper
2012
sec-b
q22
math
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Feb 5, 2013
by
thanvigandhi_1
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0
votes
1
answer
Find the mean number of heads in three tosses of a fair coin.
asked
Nov 27, 2012
by
balaji.thirumalai
cbse
class12
bookproblem
ch13
sec4
p571
q10
easy
sec-b
math
0
votes
0
answers
Suppose a girl throws a die. If she gets a 5 or 6, she tosses a coin three times and notes the number of heads. If she gets 1, 2, 3 or 4 she tosses a coin once and notes whether a head or tail is obtained. If she obtained exactly one head, what is the probability that she threw 1, 2, 3 or 4 with the die?
asked
Jan 22, 2013
by
thanvigandhi_1
cbse
class12
modelpaper
2012
sec-c
q29
math
0
votes
0
answers
A biased die is twice as likely to shown an even number as an odd number. The die is rolled three times. If occurance of an even number is considered a success, then write the probability distribution of number of successes. Also find the mean number of successes.
asked
Feb 3, 2013
by
thanvigandhi_1
cbse
class12
modelpaper
2012
sec-b
q22
math
0
votes
0
answers
How many times must a man toss a fair coin, so that the probability of having at least one head is more than 80%?
asked
Dec 29, 2012
by
thanvigandhi_1
cbse
class12
modelpaper
2011
sec-b
q22
math
0
votes
0
answers
In an examination, 10 questions of true-false type are asked. A student toses a fair coin to determine his answer to each question. If the coin falls heads, he answers 'true' and if it falls tails, he answers 'false'. Show that the probability that he answers at most 7 questions correctly is \( \frac{121}{128} \).
asked
Feb 3, 2013
by
thanvigandhi_1
cbse
class12
modelpaper
2012
sec-c
q29
math
0
votes
0
answers
A coin is based so that the head is 3 times as likely to occur as tail. If the coin is tossed three times, find the probabilty distribution of number of tails.
asked
Dec 28, 2012
by
thanvigandhi_1
cbse
class12
modelpaper
2011
sec-b
q22
math
0
votes
0
answers
A box contains 2 gold and 3 silver coins. A box is choosen at random and a coin is drawn from it. If the selected coin is a gold coin, find the probability that it was drawn from the second box. A student should not carry ornaments and other precious things to school. why?
asked
Jan 16, 2013
by
thanvigandhi_1
cbse
class12
modelpaper
2012
sec-b
q22
math
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