Question

The probability of a student getting grade $A,B,C$ and $D$ are $0.2,0.3,0.15$ and $0.35$ respectively, Then the probability that the student gets at least $C$ grade is:

• A. 0.65
• B. 0.15
• C. 0.5
• D. 0.35

Answer 1

The correct option is A ($0.65$)

Given the probability of a student getting grade $A,B,C$ and $D$ are $0.2,0.3,0.15$ and $0.35$ respectively.
Probability that a student gets at least $C$ grade $=$ (Probability of getting grade $A+$ Probability of getting grade $B+$ Probability of getting grade $C$)
$=0.2+0.3+0.15$
$=0.65$