1041.A coin is tossed 5 times. What is the probability that head appears an even number of times?
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1042.A coin is tossed 7 times. What is the probability that head appears an odd number of times?
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1043.A coin is tossed 7 times. What is the probability that tail appears an odd number of times?
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1044.A coin is tossed 5 times. What is the probability that head appears an odd number of times?
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1045.Past experience shows that 80 % of the operations performed by a doctor arc successful. If he performs 4 operations in a day, what is the probability that at least three operations will be successful?
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1046.Assume that on an average one telephone number out of 15 called between 2 P.M. and 3 P.M. on week days is busy. Why is the probability that if six randomly selected telephone numbers are called, at least three of them will be busy?
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1047.A bag contains 5 white, 7 red and 18 black balls. If four balls are drawn one by one with replacement, what is the probability that at least one is white?
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1048.A pair of dice is thrown 7 times. If getting a total of 9 is considered a success, what is the probability of at most 6 successes?
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1049.Five dice are thrown simultaneously. If the occurrence of an even number is considered as a success, find the probability of at the most 3 successes.
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