Question

23. If mean of 1, 2, 3, ... n ; is 6n/11 then the value
of n is.
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Answer 1

you you know that mean

Step-by-step explanation:

=(1+2+3+.......... +n) ÷n

6n/11=n(n+1) ÷n

5n=1

n=1/5

Answer 2

mean=sum of all observations/total number of observations

=1+2+3...+n/n=6n/11

this means no of observations=11

1+2+3...+10+11=n(n+1)/2

=11(12)/2

=66

therefore n=66/6

=11