**1. What happens if there is more than one mode for a set of value?**

For the set of values 3,

4,4, 5, 6,7,7, 8 there are two modes, 4 and 7. Give them both. The set of values is said to bebi-modal.

**2. What is the disadvantage of using the median as an average for a set of scores?**

It does not give any indication of any extremely small or large values in the set.

e.g. The median of 4, 5,

6, 7, 100 is 6 but this does not give any indication of the very high value of 100. The mean would include the value of 100 in its calculation.

**3. What is the disadvantage of using the mean as an average for a set of scores?**

One really large or small value can have a big effect on the mean. In the example above the mean will be much higher because of the effect of the value of 100.

**4. What is the disadvantage of using the mode as an average for a set of scores?**

The mode may not be typical of the whole set of values. Could be a long way from the middle values of the set.

e.g.

3, 3, 12, 13, 14, 15 15, 16. The mode is 3 but is not typical of the set of values.

**5. Which of the three averages ****mean, median and mode**** do people usually use?**

The

meanis probably what most people would normally call the "average".