EViews intervals computation and random variables

This is the first time working in EViews and I am stuck in two areas of the homework. c) and d) I highlighted in yellow what I don't know how to do. For d) I generated an equation and form a new series, z based on the z=log(salary) but I don't know how to explain the last part...highlighted. I'm attaching the stats for both y (salary) and the new z series.
Any help is appreciated.