Cumulative Frequency Table

Deena owns a corgi farm. She decides to measure the height of each of her corgis and then constructs a cumulative frequency table. $$\begin{array}{|c|c|} \hline \text{Heights (in.)}&\text{Cumulative Frequency}\\ \hline 4-6&4\\ 6-8&11\\ 8-10&20\\ 10-12&39\\ 12-14&50\\ \hline \end{array}$$