Question 4'_ Let's say IQ's are normally distributed with population mean , u= 100, and population standard deviation of 15. We can also say X "' N(100, 15). Find, a.) The IQ in the top 80%. (Hint: Look at the solutions to the participation problems for week 02/28/2022 for a similar problem) b.) The IQ in the lowest 20%. (Hint: Look at the solutions to the participation problems for week 02/28/2022 for a similar problem)