Well... how "well" is "well"? It's vague.

To add clarity, we use 3 measures to help us interpret data - Mode, Median and Mean

(a topic that we'll do into greater details in Term 2/3).

Using this example (before we look into the class data), we learnt how to interpret the table

**(**known as the

**frequency table)**and draw out what is the mode, median from the table. Mean is what we referred to as "average" in primary school.

Simply put across:

**Mode**: The most frequently occurred item**Median**: The value of the middle item- The items have to be arranged in ascending/ descending order (of the values it carries)
- If there are odd number of items, e.g. 13, then the middle item is at the 7th position (6 before and 6 after this item). The value of the 7th position item is the median.
- If there are even number of items, e.g. 20, then the items would be divided into 2 equal halves. So, we find the average of the value in the 10th and 11th position.
**Mean**: Same as the "average" we learnt in primary school- Find the sum of all the values of the items, then divide by the number of items.

With the above knowledge, given the TOTAL Grade Score,

- we can find out the mean subject grade of the class
- we are able to find the maximum (i.e. the largest possible) number of students who can score Grade 1
- we can find, if everybody scored either A1 or A2, what is the number of students who scored A1 or A2

## No comments:

## Post a Comment

Note: only a member of this blog may post a comment.