Question

This probability distribution shows the typical grade distribution for a Geometry course with 35 students. Find the probability that a student earns a grade of A, B, or C. Enter a decimal rounded to the nearest hundredth.

Answer 1

• Total marks=5+10+15+3+2=36
• No of students earned A,B,C=5+10+15=30

`\\ \rm\Rrightarrow P(A,B,C)`

`\\ \rm\Rrightarrow (30)/(36)`

`\\ \rm\Rrightarrow 0.85`

`\\ \rm\Rrightarrow 0.86`

Answer 2

.86

Explanation:

There are 5+10+15 = 30 students that earned and A, B or C

P( A, B or C) = number of students that earned and A ,B , C / total

=30/35

=.857142857

Rounded to the nearest hundredth

=.86