A. 6
B. Zero
C. 3
D. 2
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5 Comments
Right answer is ZERO.
Mean Deviation = Σ|x − μ|/N
calculate mean of 18,12,15 =(18 +12+15) / 3= 15
M.D = Σ|(18-15) + (12-15) + (15-15)|/3
M.D = Σ|+3 – 3 +0|/3
M.D = 0
when we use the standard bracket I—–I then we consider the negative values as positive so I+3-3+0I/3 TO I+3+3-0I/3= 2
Correct answer is 2…. Your answer is wrong as it is clearly defined in the concept while calculating deviation, signs whatsoever needs to be ignored …
the rule u r applying is wrong…
procedure is as
first we have to calculate mean
that is 18+12+15/ 3 = 15
Now in order to calculate deviation we have to
Substract 15 from each given number …
that is __ 18 – 15 = 3
12- 15 = -3
15 -15 = 0
——-
6
_______
signs ignored as per the concept
Deciation is 6
MD = 6 / N
MD = 6/3
MD = 2
Mean Deviation = Σ|x − μ|/N
calculate mean of 18,12,15 =(18 +12+15) / 3= 15
M.D = Σ(|18-15|+ |12-15| + |15-15|)/3
M.D = Σ|+3 + 3 +0|/3
M.D = 2
Negative sign will convert into positive bcz of absolute in the mean devation formula