27 is the total. So you divide 15 by 27 = .55 so 55%
The answer in long division would be 3 and a half
in fraction form: 3 1/2
in decimal form: 3.5 or 3.50
To solve this problem, we should note that there are:
total questions = 100
questions answered correctly = 90
questions that needed additional clues = 10
1. The first question is to find the probability that in the
third question, Mary would need additional clue. Therefore this implies that in
the first and second questions, Mary would answer it correctly. Therefore:
Probability = (question 1 answered correctly) * (question 2 answered
correctly) * (question 3 needed clue)
Probability = (90/100)*(89/99)*(10/98)
Probability = 0.08256 = 8.26%
2. The second question finds for the probability that two
consecutive needs additional clue, therefore:
Probability = (question 1 needed clue) * (question 2 needed
clue)
Probability = (10/100)*(9/99)
Probability = 9.1*10^-3 = 0.91%
