The lengths of screws produced by a machine are normally distributed, with a mean of 3 cm and a standard deviation of 0.2 cm. What can we conclude from this?
A) Approximately 68% of all screws have lengths between 2.8 and 3.2 cm.
B) Approximately 95% of all screws have lengths between 2.8 and 3.2 cm.
C) Just about all screws have lengths between 2.8 and 3.2 cm.
D) Just about all screws have lengths between 2.9 and 3.1 cm.

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The Answer of The lengths of screws produced by a machine are normally distributed, with a mean of 3 cm and a standard deviation of 0.2 cm. What can we conclude from this?
A) Approximately 68% of all screws have lengths between 2.8 and 3.2 cm.
B) Approximately 95% of all screws have lengths between 2.8 and 3.2 cm.
C) Just about all screws have lengths between 2.8 and 3.2 cm.
D) Just about all screws have lengths between 2.9 and 3.1 cm.

The Lengths of Screws Produced by a Machine Are Normally