Решение задачи N39 теория вероятностей Чебышева

39. The number of sunny days per year for a given locality is a random variable with a mathematical expectation of 75. Using Chebyshev´s lemma, estimate from below the probability that next year there will be less than 150 sunny days in a given locality.

Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)