The Pachyderm and Palace Bar and Grill is recovering afte a disastrous promotion. BCIT students were allowed to purchase tickets which gave them admission and unlimited beer from 8 pm to closing. The manager feels she could limit the destruction in the future if she hired a number of gorillas as bouncers but she needs to estimate the amount of beer consumed by the students. The actual day's records were destroyed in a minor fire that night but the following summary was obtained. Number of beers Number of students Percen t .3 5 -6 10 -9 15 0-12 10 3-15 5 6-18 5 Estimate the average number of beers consumed per student. Estimate the standard deviation for students' beer consumption (assume sample data)