1. 2. 3. 4. 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. $86.64 \%$
in Others
edited
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