title: Pandas: remove group from the data when a value in the group meets a required condition
body: <p>I have groupings of values in the data and within each group, I would like to check if a value within the group is below <code>8</code>. If this condition is met, the entire group is removed from the data set.</p>
  
  <p>Please note the value I'm referring to lies in another column to the groupings column.</p>
  
  <p>Example Input:</p>
  
  <pre><code>Groups Count
    1      7
    1      11
    1      9 
    2      12
    2      15
    2      21 
  </code></pre>
  
  <p>Output:</p>
  
  <pre><code>Groups Count
    2      12
    2      15
    2      21 
  </code></pre>