Suppose That Scores on a Test Are Normally Distributed with a Mean

question 120

Essay

Suppose that scores on a test are normally distributed with a mean of 80 and a standard deviation of 8. You have been asked to find the 70th percentile. After sketching a standard normal curve and shading the area of interest, the next step in solving this problem is to use the table of areas. Would you look for 0.7 in the body of the table or in the left-hand column? Explain your reasoning.

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Definitions:

Life Expectancy Tables

Charts used by the IRS to calculate required minimum distributions for retirement accounts.

Annual Contributions

Yearly monetary additions made to retirement savings plans, investment accounts, or other savings vehicles.

Taxable Amount

The portion of income, withdrawals, or distributions subject to tax.

Annuity Payment

Periodic payments received from an annuity contract, usually for retirement income, which can be fixed or variable in amount.