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If the mean of 5 observations x, x + 2, x + 4, x + 6 and x + 8 is 11, then the mean of last 3 observations is

2813Medium DSSSB TGT Computer Science 0 replies 2 views
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If the mean of 5 observations x, x + 2, x + 4, x + 6 and x + 8 is 11, then the mean of last 3 observations is

  • A13
  • B15
  • C17
  • D11
Correct answer: A

Explanation

Mean = x + 4 = 11, so x = 7. The last three observations are 11, 13 and 15, whose mean is 13.
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