Basic Statistics. Need to double check and need some answers

Here are more questions that I need some help with - I came up with some of the answers but need to double check them. **My answers are the ones in bold text.**

5. Customer satisfaction scores at a local store have a mean of 42.95 and a standard deviation of 2.642. Find the z-score associated with a satisfaction score of 46.3. (Round to two decimal places.) ** [(46.3-42.95)/2.642)] = 1.27**

6. You will be asked to determine if a satisfaction score of 46.3 is unusual in a population having a mean score of 42.95 and a standard deviation of 2.642 based on the z-score calculated in #5. **No …**.*why?*

7. Customer satisfaction scores at a local store have a mean of 42.95 and a standard deviation of 2.642. Find the z-score associated with a satisfaction score of 36.8. (Round to two decimal places.)

**[(36.8-42.95)/2.642)] = (-2.33)**

8. You will be asked to determine if a satisfaction score of 36.8 is unusual in a population having a mean score of 42.95 and a standard deviation of 2.642 based on the z-score calculated in #7. **NO** *why?*

9. Which employee group has the higher relative efficient rating: Group A with a rating of 85.7 in a population with a mean rate of 77.53 and a standard deviation of 15.2 or Group B with a rate of 15.3 in a population with a mean rate of 12.75 and a standard deviation of 1.4?

10. Which trash bag – regular or heavy duty – has a higher relative breaking strength: Bag A that breaks at 47.8 lbs and is a regular bag of which all have a mean breaking strength of 50.57 lbs and a standard deviation of 1.643 lbs or Bag B that breaks at 62.3 lbs and is a heavy duty bag of which all have a mean breaking strength of 65.43 lbs and a standard deviation of 2.271 lbs?