Diameters of bolts produced by a particular machine are normally distributed
with mean 0.760 cm and standard deviation 0.012 cm. Specifications call for
diameters from 0.720 cm to 0.780 cm.
a) What percentage of bolts will meet these specifications?
b) What percentage of bolts will be smaller than 0.730 cm?
Answers
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Answer: I am not sure
The z-score is:
0.32-0.30/0.01=2
.
Looking at the z-score table we find:
z-score of 2 = 0.9772
So, bolts larger than this would be:
1-0.9772 = 0.0228
Or
2% of bolts would be larger
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