Explanation
The question here is pretty straightforward; to answer it,
we are going to need to know a little more about this particular group of
numbers. On to the statements, separately first.... although we do happen to
glance at both statements and notice that one statement is about integers and
one statement is about non-integers. On the GMAT, we cannot assume that an
unspecified number is an integer, a positive or negative whole number, unless
we are specifically told so. It could be a non-integer. But we can assume that numbers are real
numbers; if you don't know what a real number is, you can forget about it or
look it up, but you don't need to know it for the GMAT. So all of the numbers
greater than 70 are integers or non-integers. The problem is that each
statements tells us about one segment of the group and not the other. For
example, Statement (1) tells us that 5% of integers are greater than 70. But,
for all we know, 0% or 100% of the non-integers could be above 70, so I've no
way of knowing the overall percentage. Statement (2) has the exact same
problem, logically speaking. So we conclude that each of the statements is
insufficient individually. We'll have to combine them. There is still a problem
here: we don't know how many integers or non-integers there are. There could be
10 integers and 100 non-integers, or 10 integers and 1,000 non-integers,
yielding different answers to the question. So the statements are insufficient
even when combined.
The correct answer is (E).
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