Engineering Mathematics Probability and Statistics

The lengths of a large stock of titanium rods follow a normal distribution with a mean (μ) of 440 mm and a standard deviation (σ) of 1 mm. What is the percentage of rods whose lengths lie between 438 mm and 441 mm?

1

81.85%

2

68.4%

3

99.75%

4

86.64%

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