Here is a list of weights, in kg, for six parcels.
15, 21, 17, 14, 21, 18
Work out the median weight.
Here are six cards. There is a number on each card. Two of the numbers are hidden.
| 4 | 7 | ? | 11 | 12 | ? |
| --- | --- | --- | --- | --- | --- |
The mode of the six numbers is 4. The mean of the six numbers is 7.
Work out the two numbers that are hidden.
