In a Manufacturing Process a Machine Produces Bolts

question 79

Multiple Choice

In a manufacturing process a machine produces bolts. The lengths of the bolts follow a normal distribution with an average of 3 cm and a variance of 0.03 cm2. If we randomly select three bolts from this process:
-What is the probability the mean length of the bolt is at most 3.1 cm?

• A)0.8413
• B)1
• C)0.7157
• D)0.2843
• E)0.1587

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