The A.P. Statistics exam consists of a multiple-choice section where each question has five choices. Sara estimates that she has
a 75% chance of knowing each question. If she does not know the answer, she will randomly guess. a) What is the probability of Sara getting a question correct?
b) The A.P. exam has 40 questions, how many might Sara expect to get correct?
It's more than 75% because if she knows it that's 75% already, then you add 20% of the 25% she didn't know. That's .20 • .25 = 0.05 or 5%. She actually has an 80% chance. <span>Then 0.80 • 40</span>
In order to find out, you add both 8 and 9 together. If the sum is above/higher than the number 13, they can all be made into a triangle. 8+9 is 17 and 17 is higher than 13.
