title: ValueError when trying to plot a histogram
body: <p><strong>Problem Background</strong></p>
  <p>I am trying to plot a histogram to see the distribution of Customer Ages in a bin of size 4. I was initially using a different size of bin, but adjusting the bin this way affected the count or the y-axis of the graph.</p>
  <p>Using plt.ylim(min, max) was my way to set the y-axis. To specify the max variable, I tried to count the largest value in the bin which was for ages (25&lt;x&lt;=35).</p>
  <p>I keep getting a value error when making the count. Even when I convert the series to an integer using .astype(int), it displays another error.</p>
  <p><strong>Error Message:</strong>
  ValueError: The truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all().</p>
  <p>Please, how do I rectify this?</p>
  <p><strong>Code Snippet</strong></p>
  <pre><code>freq, bins, patches = plt.hist(bank_churn_df['Customer_Age'], 
                                 label = 'Ages', 
                                 bins=4)
  
  plt.ylim(0,bank_churn_df[(bank_churn_df.Customer_Age &gt; 25) &amp; (bank_churn_df.Customer_Age &lt;= 35)].value_counts())
  
  </code></pre>