As reported by the U.S. Social Security Administra- tion, the average monthly benefit to retired workers is u= $419. Assume a standard deviation of o = $73. Suppose n=125 retired workers are to be selected at random. Let x denote the mean monthly benefit received by the retired workers obtained. a) Determine the standardized version, z, of the random variable x. b) What is the probability distribution of the stan- dardized version, z, of x? c) Find the probability that the standardized ver- sion of x will take a value either greater than 2.33 or less than –2.33. - comple size

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.