3. The ages of participants in a drama workshop are normally distributed with mean 18.5 years and standard deviation 2.5 years. What is the probability that the age of a random participant is (a) more than 20 years: (b) between 16 and 18 years? 4. The lifetime of a light bulb is normally distributed with mean 800 hours and standard deviation 50 hours. A random light buib is selected. What is the probability that it will last for more than 950 hours? 5.The length of a ball pen is known to be normal with mean 5 inches with a standard deviation of 0.1 inch. Desiree bought one of such ball pen. What is the probability that its length is between 4.85 inches to 5.10 inches.

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