The probability of a student scoring 75% in class work is 0.64, and the probability of a student scoring 85% is 0.45.

Event A: The student scores 75%.
Event B: The student scores 85%.

The probability of a student scoring 85% in class work, given that they have already scored 75% in class work, is 0.55. The probability of a student scoring 75% in class work, given that they have already scored 85% in class work, is 1.
Which statement is true?

Question

The probability of a student scoring 75% in class work is 0.64, and the probability of a student scoring 85% is 0.45.

Event A: The student scores 75%.
Event B: The student scores 85%.

The probability of a student scoring 85% in class work, given that they have already scored 75% in class work, is 0.55. The probability of a student scoring 75% in class work, given that they have already scored 85% in class work, is 1. 
Which statement is true?

anonymous · Answer

@ankit042  could you help

ganeshie8 · Answer

write out the given info :-

P(A) = 0.64
P(B) = 0.45

P(B | A) = 0.75
P(A | B) = 1

kropot72 · Answer

I think that neither statement is true. There is no information in the question to show that the probability of scoring 75% or 85% is conditional on the student's previous score.