Interquartile range of ungrouped data

Though one thing has got me worrying, someone today said that the best way to prepare was to learn all the mark schemes, i am not doing this, i will just attempt 1 past paper and just see the answers from the mark scheme, will i get good marks?

You probably saw my response to that

He is an AS student !!!!!!!!!!!!!

I will be around Thursday evening with the S1 book as my daughter is doing it on Friday too

He was talking out of his experience which contradicts with your view, so he is actually trying to prove that 1>30

S1 is an AS so it should probably be a doodle, except a difficult probability question can put me off.

His view relates to the discussion we were having the other week

There are students who are mathematicians and students who can pass maths exams ... his method will enable him to score well if he has a good memory and a reasonable grasp

It is always easier to do well if you actually understand

...

Hello Mr Notnek hope you are well.

This is from one of my old maths books word for word.

1. Arrange the dataset in increasing order.

2: Next:
(a) If there is an even number of data values, then the lower quartile $(Q1)$ is the median of the lower half of the dataset, and the upper quartile $(Q3)$ is the median of the upper half of the dataset.

(b) If there is an odd number of data values, throw out the middle data value (which of course has the median value of the dataset). Then the lower quartile $(Q1)$ is the median of the lower half of the new dataset, and the upper quartile $(Q3)$ is the median of the upper half of the new dataset.

3. The interquartile range $(\mathrm{IQR})$ is $Q3-Q1$

Thanks Subatomic, hope your assignment is going well.

It seems like every qualification/board has its own method. The method you posted is probably the most basic.