5.2 Fifteen students wrote a test out of 50 and got the following marks: \[ 20 ; 15 ; 13 ; 40 ; 28 ; 35 ; 40 ; 15 ; 23 ; 35 ; 28 ; 11 ; 27 ; 35 ; 10 \]

Did you know that in many educational systems, a score of 50% or above is typically considered a passing mark? With the test being out of 50, the passing threshold would be 25 marks. Analyzing the data, we can see how many students passed versus those who didn't, providing insights into the overall performance and areas for improvement. When calculating average scores, a common mistake is using the sum of the scores without dividing by the total number of students. In this case, you must ensure to calculate the total score by adding all the marks together before dividing by 15 to find the average. This will prevent skewed results and give you a clearer picture of the class performance.