Question

15.
There are 28 right-handed students in a class of 31. What is the probability that a student chosen at random will be left-handed?

Answer 1

To find the probability that a randomly selected student from the class is left-handed, we first need to determine the number of left-handed students.

Given:
- Total number of students in the class = 31
- Number of right-handed students = 28

We can calculate the number of left-handed students as follows:

\[
\text{Number of left-handed students} = \text{Total students} - \text{Right-handed students}
\]
\[
\text{Number of left-handed students} = 31 - 28 = 3
\]

Now, we can calculate the probability of selecting a left-handed student:

\[
\text{Probability (P) of left-handed student} = \frac{\text{Number of left-handed students}}{\text{Total number of students}} = \frac{3}{31}
\]

Thus, the probability that a randomly chosen student is left-handed is:

\[
\boxed{\frac{3}{31}}
\]