Fact 51: A class holds a paper airplane fly-off competition. The average distance flown is 20m with a standard deviation of 4m. Use this information to help answer the next 5 questions.

1) What is the probability that an airplane flies more than 21m? a) 0.5987 b) 0.6026 c) 0.4013 d) 0.2313

2) What is the probability that a plane flies exactly 20m? a) 0.5000 b) 0 c) 1 d) None of the above.

3) What is the probability that a plane flies less than 22m? a) 0.6915 b) 0.3085 c) 0.25 d) 1.17

4) What is the probability that a plane flies between 18 and 23m? a)0.7734 b) 0.3085 c) 0.4 d) 0.4649

5) What is the probability that a plane flies more than 20m? a) 0.25 b) 0.30 c) 0.45 d) 0.5