Answer:
5%
Step-by-step explanation:
Answer:
3.6% of the ball bearings will have diameters of 20.27 mm or more.
Step-by-step explanation:
We can calculate this proportion using the z-score.
We have a normal distribution with mean 20.00 mm and standard deviation of 0.150 mm.
The value for X is 20.27 mm.
Then, the z-score and its associated probability are:

Isolate the d
divide 7 from both sides
c/7 = 7d/7
c/7 = d
d = c/7 is your answer
hope this helps