\magnification=\magstep2

$$
{\vec{a}} \thinspace \equiv \thinspace { {  {d \vec{v}}\over{dt} } }
$$


$$
{\vec{v}} \thinspace \equiv \thinspace { \int { \vec{a}} \thinspace  {dt} } 
$$


$$
\mu  \quad = \quad  { { \sum_{i} x_i } \over { N } } 
$$

$$
\sigma  \quad = \quad  
           \sqrt { { { \sum_{i} {(x_i - \mu)}^2} 
                                 \over { N - 1 } }   }
$$


$$
{\rm time\ for\ 10\ oscillations\ } \quad = \quad  5.343 \pm 0.101 \ \ {\rm seconds} 
$$

\bye

