Question

You should be familiar with the concept of using the z-formula to calculate probabilities for values that cannot be solved neatly with the Empirical Rule. Recall several examples of how the z-calculation was used to determine the proportion of a certain salary range (refer to slides 7-8 through 7-14). The population mean for salaries was $1100, and the population standard deviation was $80. Please answer the following questions. Be sure to show your work.

1. What percent of salaries range from $1100 to $1200?
2. What percent of salaries are below $950?

What percent of salaries range from $1050 to $1250?

Answer 1