The bar graph shows the distribution of the number of walnuts per container for 20 containers at a grocery store.
The x-axis represents the number of walnuts per container, and the y-axis represents frequency.
Which of the following statements best describes what the height of the bar above '77' represents?
The total number of walnuts in all containers.
The number of containers that have exactly 77 walnuts.
The average number of walnuts in a container.
The number of walnuts in a single container.
