1. what is the difference between a bar graph and a histogram?

A bar graph is usually used for discrete data whereas a histogram is usually used for continuous data.

In a bar graph the bars usually do not touch whereas in a histogram the bars should always touch.

2. How is the mode found in a frequency table?

The mode is the most frequent or popular value so the value with the highest frequency will be the mode.

3. Can the mean be worked out from a frequency table of GROUPED data?

Yes, the mid-point of each group or class is multiplied by the frequency.

4. How is the range worked out form a frequency table?

The range will be the last value in the table minus the first value in the table.