Which of the following is the proportion of the total area that must be to the left of the median, in a histogram?

Step 1: To answer this question, we need to understand what a median is and how it relates to a histogram.

Step 2: A median is the middle value in a set of data when the data is arranged in order from least to greatest. In a histogram, the median is the point where half of the data falls to the left and half falls to the right.

Step 3: The proportion of the total area that must be to the left of the median in a histogram is 50%. This is because the median divides the data into two equal parts, so half of the area under the histogram must be to the left of the median.

Step 4: Therefore, the answer to the question is 50%.