Answer:
We'd expect there to be about 45 left-handed students.
Explanation:
Since the ratio of left-handed people to all people is about 1 to 10, we can determine how many left-handed students (L) we'd expect in a high school with 450 students using a proportion:
1 left-handed person / 10 people total = L left-handed people / 450 people total
(1 / 10 = L / 450) * 450
45 = L
Thus, we'd expect 45 left-handed students in a high school with 450 students, given that the ratio of left-handed students to all people is about 1 to 10.