super_nova Posted August 25, 2006 Share Posted August 25, 2006 Q-The arithmetic mean and standard deviation of a certain distribution are 13.5 and 1.5, respectively. what value is exactly 2 standard deviation less than the mean? a. 10.5 b. 11.0 c. 11.5 d. 12.0 e. 12.5 can anyone clarify me what the question is asking for; specially, the underlined sentence. Quote Link to comment Share on other sites More sharing options...
Vivek Goyal Posted August 25, 2006 Share Posted August 25, 2006 2 standard deviation less than the mean = 13.5-(2*1.5) = 10.5 OA should be 'A' Quote Link to comment Share on other sites More sharing options...
geekybiz1 Posted August 25, 2006 Share Posted August 25, 2006 Agree with Vivek 10.5 it is. Quote Link to comment Share on other sites More sharing options...
chatru Posted August 26, 2006 Share Posted August 26, 2006 The ans is "A" S.D = deviation from the mean 2 standard deviation is = 3 hence the ans is 13.5 - 3 = 10.5 Quote Link to comment Share on other sites More sharing options...
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