Originally Posted by

**Taka**
Also,

Would I approach this question in the same way?

"National Distributing employs 5,000 salespersons throughout Australia. The

average yearly commission earned by a salesperson is $57,000 and the standard deviation of the yearly commission is $8,540.

If a random sample of 60 salespersons is selected, what is the probability that the sample mean of their yearly commissions is less than $55,000?"

So have z = (55,000 - 57,000) / 8540 = -0.234 so the answer would be 0.4090?