The S.D. for the following data ; 21, 16, 13, 11, 9, 14, 8, 14 is
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21, 16, 13, 11, 9, 14, 8, 14 is
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Step-by-step explanation:
- So we have the given values as X and by adding we get 21 + 16 + 13 + 11 + 9 + 14 + 8 + 14 = 106
- So total values is 8
- We have Variance = Ʃ (X – X bar)^2 / N – 1
- So X bar = Ʃ X / N
- = 106 / 8
- = 13.25
- Now we need to find (X – X bar)
- (X – X bar) (X – X bar)^2
- 21 – 13.25 = 7.75 60.0625
- 16 – 13.25 = 2.75 7.5625
- 13 – 13.25 = - 0.25 0.0625
- 11 – 13.25 = - 2.25 5.0625
- 9 – 13.25 = - 4.25 18.0625
- 14 – 13.25 = 0.75 0.5625
- 8 – 13.25 = - 5.25 27.5625
- 14 – 13.25 = 0.75 0.5625
- ---------------------------
- 119.5
- Substituting we get
- Variance V = 119.5 / 8 – 1
- = 119.5 / 7
- V = 17.07
- Now standard deviation = √ variance
- = √ 17.07
- So S.D = 4.13
Reference link will be
https://brainly.in/question/26866585
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