The bar chart below shows the mean wingspan of a population of juvenile peregrine falcons (Falco peregrinus) across different age groups. The error bars show the standard deviation of the mean wingspan.
At between 6 and 8 weeks old, the mean wingspan of male peregrine falcons is less than that of females.
Calculate how much smaller the mean wingspan of males is than that of females.
Show your working. Express your answer as a percentage of the female mean wingspan, to two significant figures.
