MATHEMATICS · Subjective · CBSE · Mathematics · Probability · Probability
Problem
In a quiz of 300 questions attempted by a class, each trial resulted in one of the following events:
A: question answered correctly,
B: question answered incorrectly but attempted,
C: question left blank.
Event C occurred in 10% of the trials. Event B occurred twice as often as event A.
Determine how many questions were answered correctly.