4. Describe a descrete random variable. What is a distribution law of a descrete random variable ? How is a CDF defined? Solve the following problem. A citizen in search of work sent to three different organizations. Pro- bability of getting an invitation to the interview from the first company equals 0.1, from the second one – 0.6, from the third one – 0.3. Find the mean value, variance, mean square deviation, mode and median of the number of companies, given the positive answer. -

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A: Given Chane of striking oil = 20%

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