Questions
The mean of n items is . If the first term is increased by 1, second by 2 and so on, then the new mean is
a
x¯+n
b
x¯+n2
c
x¯+n+12
d
None of these
detailed solution
Correct option is C
Let x1,x2,…xn be the n items. Given, x¯=x1+x2+…+xnn∴ New mean =x1+1+x2+2+…+xn+nn=x1+x2+…+xn+(1+2+…+n)n=x¯+n(n+1)2n [∵ from Eq. (i) ]=x¯+(n+1)2Talk to our academic expert!
Similar Questions
. If the mean of the distribution is 2.6, then the value of y is
| Variate x | 1 | 2 | 3 | 4 | 5 |
| Frequency f of x | 4 | 5 | y | 1 | 2 |
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