Olympic Records

Patrick, Elliot, Oscar and Peter, Jaa, Lucas and Jerry, Prinn, Xander and Ryan, Pair, Korya, Sasha and Ysabel and Pat and Andrew from Rubgy School Thailand, Edward from Plumstead Manor in England, Seokwon (Andy) from Suzhou Singapore International School in China, Mahdi from Mahatma Gandhi International School in India and Angel from England all identified this event correctly.

Isaac, Mr Robinson and Miss Morgans from St. Joseph's RC Primary School, Newbury in the UK wrote:

First, we looked at all the graphs and deduced that the x-axis was the year of the event and the y-axis was the score/time achieved. We then thought about which events the score was increasing in and which ones decreased. We
thought about the types of events each graph could possibly represent and made some initial suggestions. 
Graph 1: Speed - running

Jaa, Lucas and Jerry explained:

The measurement gets less and less which could maybe show that it is a running event.

Patrick, Elliot, Oscar and Peter wrote: 

We believe that the units are in seconds.
We think it is the 100m men's event.
The world record is 9.58 and was set in 2009, but Usain Bolt didn’t do it in the Olympics, but he did it in the World Championships. The OLYMPIC record is 9.63 which was set in 2012, which corresponds to the graph so therefore we know that this is the men's 100m.

Patrick, Elliot, Oscar and Peter, Jaa, Lucas and Jerry, Prinn, Xander and Ryan, Pair, Korya, Sasha and Ysabel and Pat and Andrew, Edward, Seokwon (Andy), Mahdi and Angel all identified this event correctly.

Pat and Andrew wrote:

I think the unit is a meter because the record keeps going up.

Prinn, Xander and Ryan wrote:

At first we thought about the sports which are apt for the integers given on the y axis, firstly, I thought that it would be javelin, conversely it was brought to light after doing some research that the olympic record for the javelin is over 90 metres, then this alluded us to think about the different categories for jumps, resulting in doing a little bit of research ont he high and long jump.

Angel wrote:

It is because the longest jump was 8.9m and nobody has beaten that ever since which is why the graph finishes in 1968.
 

Mahdi thought about the y axis units:

Unit is time, which can suggest that it is either a marathon (if in hours) or a run of 1 or 2 km for 3.5 minutes. I reckon Men's or Women's 1500 metres.

Jaa, Lucas and Jerry made some suggestions based on the x axis:

A new sport due to there only being records from not long ago or it could be a women’s sport due to the Olympics not allowing women to participate a while ago.

Angel, Seokwon (Andy) and Edward identified the graph. Angel and Seokwon (Andy) used the same idea. Angel wrote: 

It is [women's 500 metres] because women’s 1500 metres started in 1972 and that’s where the graph starts.

Seokwon (Andy) added:

Identified via the approximate times, and the few number of Olympic records.

Peter, Elliot, Patrick and Oscar, Jaa, Lucas and Jerry, Prinn, Alexander and Ryan, Pair, Korya, Sasha and Ysabel, Edward, Seokwon (Andy), Mahdi and Angel identified this event. Pair, Korya, Sasha and Ysabel wrote:

y = meter
High jump - men
The y value increased over time, so it could measure length. A short length such as 2 metres may have meant the event was a jumping event including height would be most reasonable because 2 metres is too short for specific jumps. Therefore, we think it is a high jump.

Lucas, Jaa and Jerry added:

High jump because the world record in 1994, it was 2.45 meters for men.

Prinn, Xander and Ryan, Pat and Andrew, Edward, Seokwon, Mahdi and Angel correctly identified this event. Prinn, Xander and Ryan wrote:

We also think that this is the men's javelin olympic record, as there was a major rule change to do with javelin just before the 1988 olympics, which you can see on the graph; the record dropped during the 1988 olympics, and slowly climbed back up. The current men's olympic record was set in 2008 and is 90.57 metres.

Seokwon (Andy) investigated the change:

Interesting data point when Olympic Record decreases.  Redesign of javelin when almost reaching 100m as danger of javelin going closer to the seating area. Centre of mass altered, so that the javelin sticks into the ground, rather than hoizontally [travelling].

Mahdi, Angel, Seokwon (Andy), Edward, Pat and Andrew and Jaa, Lucas and Jerry correctly identified this event. Angel wrote:

Women's High Jump, because it was similar to the Men’s High Jump and it started later than the Men’s.

Mahdi wrote:

No clue. Confused about the fluctuations and drastic changes too. No trend as well, and hard to guess the units. They don't seem like time or distance, something else completely. 

Pat and Andrew, Seokwon (Andy) and Angel worked out the event. Seokwon (Andy) wrote:

Mens Decathlon, on the y-axis points
 

Jaa, Lucas and Jerry, Pat and Andrew, Edward, Seokwon (Andy), Angel and Mahdi correctly guessed the event. Jaa, Lucas and Jerry wrote:

Women’s 10km run because women have recently been able to participate in the olympics and the scores get lower and lower. The record is also 29:17.45 (held by Almaz Ayana). This applies to the graph.
Unit: Minutes:seconds

Mahdi wrote:

Some sprint, because of the decreasing time, probably? A 40 second record could be for men's 400 metres?

Pat and Andrew, Edward, Seokwon (Andy) and Angel identified the event as Men's 4$\times$100 metres Relay.

Pat and Andrew, Edward, Seokwon (Andy), Angel and Mahdi correctly identified this event. Mahdi wrote:

Probably women's 100 metres. The declining time which is lowest at around 10 seconds can be a good reason for women's 100 metres. However, I wonder if the record isn't broken since 1990 or somewhere around that year.

Angel wrote:

Women’s 100 metres, because it is similar to the men’s and the record hasn’t been broken since 1988.