For each question, do not simply provide an answer; make sure you explain how you arrived at that answer.

Answer the following question:

1. The weather forecast for the next day was 90% chance of rain. On the next day, the skies were clear. Can we say the forecast was wrong? Why or why not?

True or False?

2. It is known that 10% of people are left-handed. This means that in a randomly selected group of 20 persons two must be left-handed.

3. If you have 5 suits, 8 shirts and 9 neckties, you can come to work each time in a different outfit during the whole year.

4. A coin is flipped twice. P(two heads) + P(two tails) = 1.