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4. a. The annual income of five vice presidents of TMV industries are: $125000, 128000, 122000, $136000 and $139000 i. Calculate variance and standard deviation.

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4. a. The annual income of five vice presidents of TMV industries are: $125000, 128000, 122000, $136000 and $139000 i. Calculate variance and standard deviation. (6) ii. The annual incomes of officers of another firm similar to TMV industries were also studied. The mean was $129000 and the standard deviation $8612. Compare the means and dispersion in the two firms. (1)

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