3. A clock manufacturer investigated the accuracy of its clocks after 6 months of continuous use. They
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3. A clock manufacturer investigated the accuracy of its clocks after 6 months of continuous use. They found that
the mean error was 0 minutes with a standard deviation of 2 minutes. What percentage of clocks would be:
a) on time or up to 4 minutes fast after 6 months of continuous use? [2]
b) on time or up to 6 minutes slow after 6 months of continuous use? [2]
c) between 2 minutes slow and 6 minutes fast after 6 months of continuous use?
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