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When you have obtained results from your experiment or investigation, you then need to process them. In most investigations, you will have obtained a set of numbers as the results. One way to process these is to calculate the average value. There are three main types of average: median, mode and - the subject of this science quiz - mean.

1.

We can use the mean values of a set of results to ...

plot a scatter diagram

write a hypothesis

draw the diagram

write a risk assessment

Adding a line or curve of best fit then shows the correlation between the variables that have been investigated

2.

What is the mode for this data? 11, 11, 13, 13, 11, 14, 11, 11, 12

11

12

13

14

It is the most common number in the data set

3.

To calculate the mean, we divide the sum of the results by the...

average

sample size

range

statistic

Larger sample sizes give more reliable results

4.

Find the mean of the following data: 4, 6, 9, 3, 6

5.4

5.5

5.6

5.7

Sum then divide by the sample size

5.

Average can never be the same value as the maximum unless it is ...

the mean

the minimum

the mode

the median

The other types of average must be less than the maximum

6.

What is the median for this data? 11, 11, 12, 13, 15, 19, 21

11

12

13

21

The median is the middle value. The 4th number in the list of 7 numbers in ascending order

7.

Mean is also known as the...

mode

median

average

range

Average is a general word that includes the median and the mode so if you are stating that you are going to work out the average value, strictly speaking you would need to specify which one you intended to use

8.

The sample size is the...

range

number of results

mode

graph

You only need a sample size of two to calculate the mean

9.

The mode is...

the same thing as mean

equal to the average

the number that is repeated most often

the middle value

In some cases, you would be more interested in the mode than the mean

10.

What is the mean for the values: 13, 18, 13, 14, 13, 16, 14, 21, 13

15

16

17

18

Two thirds of the numbers are less than the average, this shows you how you need to be careful. In an experiment, the values of 18 and 21 could be anomalous results and may need re-checking for accuracy

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