Video Transcript
The table shows the marks that four
students received in their end-of-year exams. Calculate the mean mark of student
(C).
The table shows the end-of-year
exam marks for four students. But we’re only asked about student
(C). So we just need to focus on
them. We’re asked to calculate their mean
mark. So let’s recall how we find the
mean of a set of data. We divide the sum of all the values
in the data set by how many values there are. This effectively tells us what the
student would score in each exam if their total remained the same but was divided
equally between every subject.
There are five values in this data
set, the student’s exam marks in mathematics, chemistry, physics, biology, and
history. The sum of these five values is
45. Hence, the mean mark achieved by
student (C) is 45 over five, which is nine. This tells us that if student (C)
had scored 45 marks in total, but this total was spread equally across all subjects,
they would’ve achieved nine marks in each subject.