標題:
Probablitiy questions
發問:
The probability of getting a head by tossing a special coin is 0.55 Let Y be the number of heads obtained when tossing this coin 4 times a)what is the probability of getting a head when tossing the special coin once? b)find the mean and standard deviation for the random variable Y.
(a) 0.55 (b) E(Y) = np = 4 * 0.55 = 2.2 Var(Y) = npq = 4 * 0.55 * 0.45 = 0.99 Standard deviation of Y = 0.995
其他解答:
Probablitiy questions
發問:
The probability of getting a head by tossing a special coin is 0.55 Let Y be the number of heads obtained when tossing this coin 4 times a)what is the probability of getting a head when tossing the special coin once? b)find the mean and standard deviation for the random variable Y.
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最佳解答:(a) 0.55 (b) E(Y) = np = 4 * 0.55 = 2.2 Var(Y) = npq = 4 * 0.55 * 0.45 = 0.99 Standard deviation of Y = 0.995
其他解答:
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