Numerical - Standard deviation, given diameter of shaft & hole

Q.  What is the standard deviation of clearance population for the diameter of shaft and hole assembly specified below?
Shaft diameter = 30 ± 0.15
Hole diameter = 30.5 ± 0.25
- Published on 16 Sep 15

a. 0.097 mm
b. 0.059 mm
c. 0.036 mm
d. 0.390 mm

ANSWER: 0.097 mm

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