the hamonic mean of 1 , 1/2 , 1/3 .............. 1/n is
a ) 1 / n+1
b) 2 / n+1
c) n+1 / 2
d) 1 / n - 1
give workings also
the hamonic mean of 1 , 1/2 , 1/3 .............. 1/n is
a ) 1 / n+1
b) 2 / n+1
c) n+1 / 2
d) 1 / n - 1
give workings also
| Originally posted by : Mahesh sharma | ||
 |
the hamonic mean of 1 , 1/2 , 1/3 .............. 1/n is a ) 1 / n+1 b) 2 / n+1 c) n+1 / 2 d) 1 / n - 1 give workings also |
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total no. of observations is 'n'
sum of reciprocal of elements 1/1 + 1/1/2 + 1/1/3 ....1/1/n or
1+2+3+4+....n = n(1+n)/2 ( sum of AP)
so hm is n/n(1+n)/2
which comes to 2/n+1 this is the answer option no. 2
should be correct
Thanks very much bro......... god bless........
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