Notice that:
Now, we use the formula for the z-score:
Then the percentage of the calls that lasted less than 10 min is 15.87%
Answer:
As we can observe,
F(1) = 567
F(2) = 189 = 567/3 = F(1)/3
F(3) = 63 = 189/3 = F(2)/3
=> F(4) = F(3)/3 = 63/3 = 21
Hope this helps!
:)
$6:00
First you can see that it’s 2:12 so if you break it into a half you get 1:6 so the answer is $6:00 per inch