4. The average consumer of a certain product is 23 years of age with standard deviation of 4.3 years. If a random consumer of this product is selected, find the probability that the age of the consumer is less than 21. 5. Given the consumers from problem #4, find the probability that the age of the consumer is between 21 and 24. 6. Given the consumers from problem #4, what would be the age range of the youngest 20% of consumers