two coin are tossed 4 times ,find?

mattamimi

1)the probability of 2 heads in 4 times ?
2)the probability of less than one head once?
3)the probability of more than 2 tails in 3 times ?
4)the expected number of two tails ?
5)the variance of the number of 2 heads

Mark44

Quote by mattamimi

1)the probability of 2 heads in 4 times ?
2)the probability of less than one head once?
3)the probability of more than 2 tails in 3 times ?
4)the expected number of two tails ?
5)the variance of the number of 2 heads

What have you tried?

Redbelly98

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mattamimi	two coin are tossed 4 times ,find? Tweet 1)the probability of 2 heads in 4 times ? 2)the probability of less than one head once? 3)the probability of more than 2 tails in 3 times ? 4)the expected number of two tails ? 5)the variance of the number of 2 heads

Redbelly98 Mentor Blog Entries: 10	Note, here is the active thread for this problem: http://www.physicsforums.com/showthread.php?t=401476