Ignore the number above 10 hours, that's not actually relevant to the answer. A has the lowest probability of not lasting at least 10 hours, compared to 3 out of 20 for the other two. This is counter to the intuitive assumption that the one with the highest median will has the lowest probability of short life. Most high schoolers only see frequency histograms in advanced science classes, not in normal math and certainly not in the 4th grade. Sample Math Problem Teachers say the math section of the new fourth-grade test is particularly difficult, requiring students to read story type problems and answer questions with words, numbers and drawings.
Many problems require a number of steps to reach the correct answer.
Your class project is to build a bird feeder. Explain how you could use the information given to find the total cost of the materials. Example problem shows a bird house with a platform of a certain size, and material at a certain cost. The solution was not just to get the right answer, in fact, the explanation was graded more important than a right answer. For each side of the tray, times 4 by 2 and get 8.