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20 Jul 2006, 03:54
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Set S contains four elements 3, 4, 5 and x. If x is a number chosen randomly from the set of positive digits {1, 2, 3…,9}, the probability that the standard deviation of the set S is more than 1 is between
(A) 0 and 0.2 (B) 0.2 and 0.4 (C) 0.4 and 0.6 (D) 0.6 and 0.8 (E) 0.8 and 1.0
(A) 0 and 0.2 (B) 0.2 and 0.4 (C) 0.4 and 0.6 (D) 0.6 and 0.8 (E) 0.8 and 1.0
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20 Jul 2006, 05:42
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shoonya
Standart deviation will certainly be more than 1 if x=7,8 or 9.... Because the largest number in set S is 5.....
So the probability is 3/9 or 1/3.... 3 favourable outcomes, 9 is total possibilities (1,2,3,4,5,6,7,8,9)
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