Question

According to the table below, what is the probability that the grade of a student chosen at random will be a B or higher?A. 4/7B. 3/7C. 1/7D. 2/7

Answer 1

We are required to find the probability that a student chosen at random will have a grade B or a higer grade.

This means that the students can either have a grade B or a grade A

The use of or in probability simply means an addition of the probabilities involved.

Now we have ;

$P(B)=\frac{4}{35}$$P(A)=\frac{6}{35}$

The required probability is now

$P(A\text{ or B\rparen}=\frac{6}{35}+\frac{4}{35}=\frac{10}{35}=\frac{2}{7}$

The right choice is OPTION D