The number of books read by 7 students last yr were 10,5,p,q,r,29 and 20. What was the range of the numbers of books read by the 7 students last year?
1) 5<p<q
2) p<r<15
1) 5<p<q
2) p<r<15
you need to know the smallest and the biggest number to know the range.
1) tells you that p and q are less than 5, but nothing on r, so r could be the smallest, but you wouldn't know, insufficient.
2) tells you that p and r are less than 15, and that r is more than p, but nothing on q, so q could be the biggest. insufficient
using both you know that the smallest is 5, but you don't know if the biggest is 29 or q, so answer is E.
