Aclass is competing in a state-wide reading competition. a simple random sample of your class indicates that 4 students read a total of 11 books last month. about how many books do you expect your class of 31 students to have read after one month and after three months?

Since 4 students read 11 books last month, on average 1 student reads 2.75 books per month.  We can multiply 31 by 2.75 to find an estimation for the amount of books the whole class read.  This is equal to 85.25.

So, the class reads 85.25 books per month.

We multiply this number by three to find the amount of books the students read in 3 months.  85.25*3=255.75 books.