CIMA BA2 Measures of dispersion – Discrete variables

Comments

1. jorped says

   January 8, 2025 at 11:41 am

   Hi, I think there is a small mistake in the exercise. If you check the 2 complaints row, the number of observations is 4, and the (x-Mean) 2 is 0.21. Then the f(x-Mean) 2 = 0.85, not 0.17, and the sum (x-Mean) 2 should be 9.23, not 8.54. Finally, the variance should be 0.71, not 0.66. The difference is very small but considering how strict seem to be the tests this would lead to a mistaken answer.
   Correct me, please, if I am wrong.

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   • roccof says

     January 10, 2025 at 10:38 pm

     Yes, it is wrong, it is 0,85 is the correct input. However, as it is an exercise to practice and understand the concept of Variance/std deviation, it does not really matter to be honest in my opinion.

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