Final answer:
It is true that students should skip difficult items and return to them later on standardized tests. The probability of passing a 10-question true-false quiz with at least a 70 percent by guessing is low due to the high likelihood of making incorrect guesses on each independent question.
Step-by-step explanation:
When taking standardized tests, it is generally a good strategy for students to skip difficult items and return to them later. This approach can help improve time management and ensure that students answer as many questions as possible in the time allotted, by first tackling the questions they are more confident in. Therefore, the statement is true.
The probability of a student passing a 10-question true-false quiz by guessing randomly with at least a 70 percent score can be calculated using binomial probability. The student needs to get at least 7 questions right. The probability of guessing one question correctly is 0.5 since there are only two possible answers (true or false), and each is equally likely. To find the probability of getting exactly 7, 8, 9, or 10 questions right, we would sum the probabilities of each of these outcomes. However, since this requires detailed calculation we can imply that the probability is relatively low.