# Problem of the Week Problem B Traffic Predictions

Petr was standing at the bus stop during rush hour and started counting the passing vehicles. In the first five minutes he waited, he counted $$20$$ cars, $$25$$ vans and $$15$$ trucks.

1. Based on Petr’s sample data, what is the theoretical probability that the next vehicle will be a truck?

2. Petr counted vehicles for another five minutes and discovered that the experimental probability of a vehicle being a car was the same for his first and second samples. If Petr counted a total of $$84$$ vehicles in his second sample, how many of those vehicles were cars?

Theme: Data Management