Find the arithmetic mean of first 20 natural numbers
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Mean = (1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20)/20
n(n+1)/2
20(21)/2
210/20
10.5
Answered by
1
We need to find out sum of first 20 natural numbers
Which is given by
(n)(n+1)/2
= 20*21/2
Now for average divide by 20
Average = 20*21/2*20
= 10.5
Which is given by
(n)(n+1)/2
= 20*21/2
Now for average divide by 20
Average = 20*21/2*20
= 10.5
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