A family of pdf's that has been used to approximate the distribution of income, city population size, and size of firms is the Pareto family. The family has two parameters, k and 0, both > 0 and the pdf is the following. { ko* x > 0 f(æ) 0, x < 0 What can you say about E(X), if k = 1? Choose the option 'None among the others', if your answer is different from all the others. O E(X)is equal to 1. None among the others O E(X) cannot be described without first defining 0. E(X) is undefined. O E(X)is equal to 0.

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