Answer the following questions using thez-score chartor by using a spreadsheet.

4. For a mean of 75 and a standard deviation of 3, find P(X 2 77). 5. For a mean of 153 and standard deviation of 25, find P{130 5 X 5 170). 6. IO scores of people around the World are normally distributed, with a mean of 100 and a standard deviation of 15. A genius is someone with an IQ greater than or equal to 140. What percent of the population is considered genius