ruby - rails: organizing data into a table using for -

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i have following view:

<table class="fixed">                                                                               <tr>                                                                                  <th>student name</th>     <!-- create many <th> there evaluations -->     <% @eval_count.times |i|  %>                                                        <th>evaluation <%= i+1 %></th>     <% end %>         <th>student average <br />(for goal)</th>    </tr>                                                                               <% eval in @evals %>                          <tr class="<%= cycle("odd", "even", name: "evals")%>">         <!-- eval returns { s_id [eval],[eval]} -->       <td><%= eval[1].first.student.name%></td>        <!-- in each student's row, print score each consecutive evaluation -->       <% @eval_count.times |i|  %>                                                          <td><%= eval[1][i].score %><% @ss_scores << eval[1][i].score %></td>        <% end %>       <td><%= @ss_scores %></td>     </tr>                 <% reset_cycle("evals") %>       <% end %>                                                                         </table>  <% @ss_scores.in_groups(@student_count, false) |group|%>     <%= (group.sum.to_f/group.size).round(2) %>                                                     <% end %>

which renders following:

enter image description here

i want put average each student in last column, @ss_scores variable , calling on doesn't work. when for loop has finished, @ss_scores can worked nicely in bottom of screenshot. idea how better?

try emptying array everytime, using [] , calculate average inline, below

 <td><%= @ss_scores.inject(0.0) { |sum, el| sum + el } / @ss_scores.size %></td>  <% @ss_scores = [] %>

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<% eval in @evals %>                               <tr class="<%= cycle("odd", "even", name: "evals")%>">             <!-- eval returns { s_id [eval],[eval]} -->           <td><%= eval[1].first.student.name%></td>            <!-- in each student's row, print score each consecutive evaluation -->           <% @eval_count.times |i|  %>                                                              <td><%= eval[1][i].score %>               <% @ss_scores << eval[1][i].score %>             </td>            <% end %>           <td><%= @ss_scores.inject(0.0) { |sum, el| sum + el } / @ss_scores.size %></td>           <% @ss_scores = [] %>         </tr>                     <% reset_cycle("evals") %>        <% end %>

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