20 birds were caught for ringing. Their wing spans (x) were measured to the nearest centimetre. The following summary data was worked out: = 316 = 5078 a Work out the mean and the standard deviation of the wing spans of the 20 birds. One more bird was caught. It had a wing span of 13 centimetres b Without doing any further working say how you think this extra wing span will affect the mean wing span.

AppendixLO1