tabular rq

<table border="1" style="width:20%">
  <tr>
  <td> i </td><td> 1 </td><td> 2 </td><td> 3 </td><td> 4 </td><td> 5 </td><td> 6 </td><td> 7 </td><td> 8 </tr>
<tr><td>X_{i} </td><td> 2</td><td>0</td><td>3</td><td>5</td><td>6</td><td>3</td><td>5</td><td>5</td> </tr>
<tr><td>Y_{i} </td><td> 4</td><td>7</td><td>0</td><td>5</td><td>9</td><td>8</td><td>9</td><td>1</td> </tr>
</table>