If the mean salary of probation officers in the United States is $31,256, and the standard deviation is $3,000, find the following probabilities for a randomly selected probation officer. Assume the variable is normally distributed.

a. The officer earns more than $35,000.
b. The officer earns more than $25,000.

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

17. a researcher measures three variables, x, y, and z for each individual in a sample of n = 20. the pearson correlations for this sample are rxy = 0.6, rxz = 0.4, and ryz = 0.7. a. find the partial correlation between x and y, holding z constant. b. find the partial correlation between x and z, holding y constant. (hint: simply switch the labels for the variables y and z to correspond with the labels in the equation.) gravetter, frederick j. statistics for the behavioral sciences (p. 526). cengage learning. kindle edition.