How do you calculate the total frequency from a histogram?

To calculate the total frequency from a histogram, sum the frequencies of all the bars.

In a histogram, each bar represents a range of values (called a class interval) and the height of the bar shows the frequency of data points within that range. To find the total frequency, you need to add up the frequencies of all the bars.

For example, if you have a histogram with five bars, and the frequencies of these bars are 3, 7, 5, 6, and 4, you would add these numbers together: 3 + 7 + 5 + 6 + 4 = 25. Therefore, the total frequency is 25.

When reading a histogram, make sure to check the vertical axis, which usually represents the frequency. Each bar's height corresponds to the number of data points in that class interval. Sometimes, the frequencies might be written above or inside the bars, making it easier to sum them up.

If the histogram uses relative frequencies (percentages) instead of absolute frequencies, you can still find the total frequency by converting the percentages back to actual counts, provided you know the total number of data points. For instance, if a bar represents 20% of the data and you know there are 50 data points in total, that bar corresponds to 0.20 * 50 = 10 data points.

Remember, the total frequency is simply the sum of all individual frequencies, giving you the total number of data points represented in the histogram.