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The Chicago July 4th celebration includes a concert at the Petrillo Music Shell in Grant Park followed by traditional
fireworks. The Chicago Symphony Orchestra is making a one-time appearance next year and the city needs to estimate
the number of people who will attend. If the weather is good, 175,000 people are expected. The attendance estimate if
it rains is 120,000. Chicago meteorologist predicts rain after midnight with a 90% probability. However, there is a 70%
chance that the storm will move in 4 hours earlier, which will affect the festivities. What is the expected attendance at
the July 4th CSO appearance?
136,500
150,400
115,238
75,600