Please answer step by step, applying normal distribution formulas, the previous answer you provided me was incomplete. I need calculations and formulas:
The Rivera family has twin girls, Rosa and Maria. They both graduated from college two years ago and now each earn $50,000 a year. Maria works in the retail industry, where the mean salary for executives with less than five years of experience is $35,000, with a standard deviation of $8,000. Rose is an engineer. The mean salary for engineers with less than five years of experience is $60,000, with a standard deviation of $5,000. Compute the Z-scores for Rosa and Maria, and comment on the results.