Zara is conducting research on ring-tailed lemurs and collects the following data on the lengths of tails in cm for 11 full-grown females in a particular group. 62 59 57 60 61 58 63 56 57 57 60

Given that these lengths are normally distributed in the entire population, what is the width of the 95% confidence interval for the mean length? Give your answer as a single number rounded to three significant figures.