Subject
Quantitative Aptitude
Topic
Average
if the mean of 5 observations X, X + 2 ,X + 4, x + 6 and X + 8 is 11 then the mean of the last 3 observations is-
if the mean of 5 observations X, X + 2 ,X + 4, x + 6 and X + 8 is 11 then the mean of the last 3 observations is-
ক)
17খ)
11গ)
13ঘ)
15Explanation
First, you need to solve for x: (x + x + 2 + x + 4 + x + 6 + x + 8) / 5 = 11 x + x + 2 + x + 4 + x + 6 + x + 8 = 55 5x + 20 = 55 5x = 35 x = 7 Now, substitute for x in each of the last three terms: x + 4 + x + 6 + x + 8 = (7 + 4) + (7 + 6) + (7 + 8) = (11) + (13) + (15) = 39 / 3 = 13 The mean is 13.Related questions
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