1. Tardigrade
  2. Question
  3. Mathematics
  4. The variance of first 20 natural numbers is

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. The variance of first $20$ natural numbers is

WBJEEWBJEE 2015Statistics

Solution:

Variance of $n$ natural numbers
$=\frac{n^{2}-1}{12}=\frac{(20)^{2}-1}{12}[\because n=20]$
$=\frac{400-1}{12}=\frac{399}{12}=\frac{133}{4}$