Question 1186324
use the following calculator.


<a href = "https://davidmlane.com/hyperstat/z_table.html" target = "_blank">https://davidmlane.com/hyperstat/z_table.html</a>


answers to your questions.


a.What percent of the population obtains scores of 410 or less?


.1841 = 18.41%


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b.What is the minimum score needed to rank in the top 5% of the populations?


664.485


<img src = "http://theo.x10hosting.com/2021/101802.jpg" >



c.A psychologist wishes to test a new learning strategy on the bottom 15% of those who took the Math SAT. What cut-off score should she use to select participants for her study?


396.357


<img src = "http://theo.x10hosting.com/2021/102803.jpg" >