The International Federation of the Phonographics Industry reported that 95% of music downlads in the year 2008 were illegal. A random sample of 250 downloads in the year 2008 were illegal. A random sample of 250 downloads is studied. a) Find the mean ; and standard deviation o. . b) Find the probability that more than 97% of the sample downloads are illegal. c) Would it be unusual if less than 90% of the sample downloads are illegal