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Please solve this question. quickly 5. A waiter at the restaurant starts shifts with 0 dollars. Every guest gives him 5 or 10 dollars as

Please solve this question. quickly

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5. A waiter at the restaurant starts shifts with 0 dollars. Every guest gives him 5 or 10 dollars as a tip, with 5 dollar tip being 2 times more probable than 10 dollar one. One day the waiter served 4 guests. Calculate : a) probability of waiter getting less than 30 dollars in tip. b) expected sum of tips after 4 guests

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