Of 20 test scores, seven are less than or equal to 81. What is the percentile rank of a test score of 81?
To find the percentile rank of a test score of 81, we need to determine the percentage of scores that are equal to or below 81.
Step 1: Calculate the number of scores that are less than or equal to 81.
Given that there are 7 test scores that are less than or equal to 81.
Step 2: Calculate the percentile rank.
To find the percentile rank, divide the number of test scores less than or equal to 81 by the total number of scores, and then multiply by 100.
Percentile rank = (Number of scores ≤ 81 / Total number of scores) x 100
In this case, the total number of scores is 20.
Percentile rank = (7 / 20) x 100
Calculating the value:
Percentile rank = 0.35 x 100 = 35%
Therefore, the test score of 81 has a percentile rank of 35%.
To find the percentile rank of a test score of 81, we need to determine the percentage of scores that are less than or equal to 81. Here are the steps to calculate the percentile rank:
Step 1: First, count the number of scores that are less than or equal to 81. In this case, there are seven scores that meet this criterion.
Step 2: Next, calculate the total number of scores. Given that there are 20 test scores in total, the total number of scores is 20.
Step 3: Divide the number of scores less than or equal to 81 by the total number of scores and multiply by 100 to find the percentage. In this case, (7/20) * 100 = 35.
Therefore, a test score of 81 has a percentile rank of 35. It means that 35% of the test scores are less than or equal to 81.