Refer to figure.
First observe the location of Iceland, and note carefully the direction of North (the meridian running through Iceland). As these winds are all relatively similar in direction, their directions and speeds can simply be averaged mathematically by calculating the mean. This is not the correct method when the directions are very different.

The wind barbs show the direction and the speed of the forecasted wind, and we can estimate their directions (and read off their speeds) as follows:

• Top left: 260°/25 kt
• Top right: 250°/30 kt
• Bottom left: 250°/20 kt
• Bottom right: 230°/25 kt

It is aready quite clear which is the correct answer, but if we are to take the mean of these directions, you get

• (260 + 250 + 250 + 230) / 4 = 247.5°

And taking the mean speeds you get

• 25 + 30 + 20 + 25 = 25 kt

So the correct answer is 250°/25 kt