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The lengths of a large stock of titanium rods follow a normal distribution with a mean $(\mu)$ of $440$ mm and a standard deviation $(\sigma)$ 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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