Many celebrities in public figures have Twitter accounts with large number of followers. However, some of these followers are fake, resulting from accounts generated by spam and computers. In a sample of 44 Twitter audits, the mean percentage of a fake followers was 13.8 with a standard deviation of 9.4.

construct a 90% interval for the mean percentage of fake Twitter followers round the answers to one decimal place.

A 90% confidence interval for the mean percentage of fake Twitter followers is [] < mean < []