Which of the following is not a property of pdf of speech signals?

Which of the following is not a property of pdf of speech signals? Correct Answer Increasing function of amplitudes between these extremes

There is a non-uniform probability distribution of speech amplitude. The pdf of a speech signal is in general characterized by a very high probability of non-zero amplitudes, a significant probability of very high amplitudes, and a monotonically decreasing function of amplitudes between these extremes.
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