[Jeffrey ảo nẻ] [92 thá»§ thuáºt giúp bạn trở thà nh báºc thầy trong giao tiếp] [Toán tổ hợp] ["Phan Huy KháÂÃÆ%EF%BF] [Du mục] [David, the promoter of an outdoor concert, expects a net profit of $100,000, unless it rains, which would reduce the net profit to $40,000. The probability of rain is 0.20. For a premium of $29,000 David can purchase insurance coverage that would pay him $100,000 in case of rain. Find the expe] [%C9%F1%C6%E9%B8ߙCҺѹ%C2%ED%B4%EF] [k? lu?t = t? do] [Mảnh vÃÃâ€] [��ߧ�ѧ�ߧѧ� �ܧڧ�ݧ��� �ܧѧ� ��� �է��ԧ�ާ� �ߧѧ٧��ӧѧ֧���]