The mean duration of the series : a,a+d,a+2d,………,a+2n from its mean is
A) n(n-1)
B) n(n-1) /2
C) n(n+1) /2
D) n(n+1) d/2n+1
Correct Answer:
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Q7: Calculate median 35,23,45,50,80,61,92,40,52,61
A)23
B)50
C)80
D)51
Q8: Find the range and the coefficient of
Q9: Variance= _
A)S.D
B)X
C)C.V
D)S.D2
Q10: If all the values of a series
Q11: For a frequency distribution M.D from mean
Q13: Find the sum of the duration of
Q14: The varience of 15 observations is 4,
Q15: Find the value of third quartile if
Q16: Mean deceiation which is calculatedis
A)Mean
B)Median
C)Mode
D)None of these
Q17: Find the probable error if r=0.6 and
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