Two competitive brothers, who work in two different industries, were comparing their salaries. Because there is a difference of 4 years in their respective work experience, they decided to compare, not their actual salaries, but to compare their salaries against their company averages to see who is doing better. The following gives the brothers salaries, companies mean, and standard deviation for each company.

Brother Salary ơ

Tom 84000 75000 7000

Andy 75500 60000 8200

What is the z-score of Tom's salary?