Final answer:
To determine what percentage of sixth graders at Mary Lillard passed the math CBA, the number of students who passed (315) is divided by the total number of students (500), resulting in 63% of the students passing. Therefore, 63 percent of sixth graders at Mary Lillard passed the last math CBA.
Step-by-step explanation:
To calculate what percent of sixth graders at Mary Lillard passed the last math CBA, we first need to find the total number of sixth graders who took the exam. This is the sum of those who passed and those who did not pass, so we have 315 who passed and 185 who did not pass, giving us a total of 500 students.
Next, we calculate the percentage that passed by dividing the number of students who passed by the total number of students, and then multiplying by 100 to convert the fraction into a percentage:
Percentage of students who passed = (Number of students who passed ÷ Total number of students) × 100
Substituting the given numbers, we get:
Percentage of students who passed = (315 ÷ 500) × 100 = 0.63 × 100 = 63%
Therefore, 63 percent of sixth graders at Mary Lillard passed the last math CBA.