The answer is C because when you rotate 90 degrees clockwise (x,y) becomes (y,-x)
Write the number out:
ex) 2 dots on number 3 so write number 3 twice and etc
3,3,4,5,5,5,6,8,8
find the middle number
5 is the middle number so it’s the median
Let
be the random variable for the number of marks a given student receives on the exam.
10% of students obtain more than 75 marks, so

where
follows a standard normal distribution. The critical value for an upper-tail probability of 10% is

where
denotes the CDF of
, and
denotes the inverse CDF. We have

Similarly, because 20% of students obtain less than 40 marks, we have

so that

Then
are such that


and we find

M/3
OR
the quotient of a number, m, and 3
hope this helps :)