Question

This probability distribution shows the

typical grade distribution for a Geometry
course with 35 students.
Grade
A B C
D
F
Frequency 5 10 15 3 2
that a stu
Find the probability that a student earns a
grade of B or C.
p = [?]
Enter a decimal rounded to the nearest hundredth.
Enter

Answer 1

Explanation:

a probability is always the ratio of desired cases over total possible cases.

the overall total cases are 35.

we have 10 for B and 15 for C, so the desired cases for students earning a B or C are 10+15 = 25

so the probability that a student earns a B or a C is

25/35 = 5/7 = 0.714285714... ≈ 0.71