A consulting company conducts a survey of 21 telecom company's sales people, and finds the average salesperson has $100,000 in sales per year, and that there is a sample standard deviation of $10,000.
a) In order to be in the top 10% of sales people, how much or more must a salesperson sell per year?
b) In order to be in the bottom 5% of sales people, how much or less must a salesperson sell per year?
c) In order to be in the top 0.5% of sales people, how much or more must a salesperson sell per year?
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