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  1. Question 1 of 4
    Decking screws are produced by a machine and the lengths are normally distributed with a mean of 6cm and a standard deviation of 0.02cm. What interval does the following percentages cover?
    (a) 68%
    (b) 95%
    (c) 99.7%
    (d) What is the percentage of the lengths that are more than 3 standard deviations away from the mean?
    • (a) to cm
      (b) to cm
      (c) to cm
      (d) %