Answer:
8
Step-by-step explanation:
Z score=(data value-mean)/standard deviation
z=(90-100)/15=-0.6666666667
we can use synthetic division
and then we can find quotient
we can see in the image
we will get



so, we get
.............Answer
We can divide 143.50 by 7. This gives us 20.5. This means that she works 20.5 hours a week or 21 hours if you round up.