1. You are told that = 2.2, = 0.6 and x = 3.1. Calculate the corresponding z value.

Please give your answer correctly rounded to two decimal places.

2. The CEO of a company with 4805 employees, wants a sample of employees to take a survey about their job satisfaction. She takes a random sample of 155 employees and sends them a link to a survey site so that their responses will remain anonymous. The result of the survey informs her that 79% of employees are satisfied with their job. What is the population size?

3. For a Normal model with = 2.18 and = 13.4, what is the X value when Z = 1.96? Give your answer correctly rounded to two decimal places.