SOLUTION: A student after lectures at a university can come back home either by a trolleybus or by a tram. He goes differently: he chooses a trolleybus for 2/5 cases and a tram for 3/5 cases
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-> SOLUTION: A student after lectures at a university can come back home either by a trolleybus or by a tram. He goes differently: he chooses a trolleybus for 2/5 cases and a tram for 3/5 cases
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Question 1180784: A student after lectures at a university can come back home either by a trolleybus or by a tram. He goes differently: he chooses a trolleybus for 2/5 cases and a tram for 3/5 cases. If he goes by a trolleybus, he comes back home to four o'clock in the afternoon in 70 % of cases, and if he goes by a tram, he comes back - only in 65 % of cases. What is the probability that he will come back home by four o'clock for a randomly taken day? Answer by ikleyn(52763) (Show Source):
