The variance of the variates 112 , 116 , 120 , 125 , 132 about their A.M is

The variance of the variates 112,116,120,125,132 about their A.M is
  1. 58.8
  2. 60
  3. 48.8
  4. 61.8

Solution

The given observations are 112,116,120,125,132

Now, x¯=∑xin=6055=121

And ∑xi-x¯2=81+25+1+16+121=244

∴ Variance, σ2=∑xi-x¯2n=2445=48.8

Asked in: AP EAMCET 2021 (19 Aug Shift 1)

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