C. The way the sample was chosen may overrepresent or underrepresent students taking certain language classes.
The samples he chose may not be a representative sample because the number of students per foreign language class may not be the same. Since classes have different numbers of students, one may have a very large number of students while another may have only a few. Taking equal number of students per class is not a representative sample because it doesn't represent the students correctly.
Answer:
99
Step-by-step explanation:
110% × 90 = 99
<em>OR</em>
110/100 × 90 (Simplify this)
11/10 × 90 (Divide 10 into 90 / Cross multiply)
11 × 9 = 99
Answer: X=9
Step-by-step explanation: