Mixtures, anomalies, matching

Spot the abnormal, untangle overlapping groups, match without duplicates

6 exercises

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What this is for in real life
Spotting what is out of the ordinary, untangling what is mixed up, pairing things without duplicates: three questions that banks, factories and labs ask every day. - Card fraud. Banks check every card payment…
The trader's notebook
You join a small asset management firm that buys and sells shares. A share is a part of a company; its price changes every day on the stock market. The managers follow a few stocks with a particular behaviour, shown…
The greenhouse probe
You have just joined the team that runs an automated production greenhouse. In each compartment, a probe measures air humidity every five minutes. The normal level is never the same: it follows the rhythm of day and…
The sensor line
Your greenhouse alarm has proven itself. Management now puts you in charge of quality control on a machining line. Each part that comes out passes in front of a row of sensors (length, diameter, mass, cutting…
The faults
You have just joined the seismological observatory of a mountain region. Each earthquake detected by the sensor network is located: east-west position x and north-south position y (in km), depth z (in km). Tremors…
The peeled-off labels
The city's seed library lends heirloom seeds: 40 varieties, grouped into four families (beans, squash, tomatoes, lettuces) of ten varieties each, often very similar. Last night, a water leak ran through the shelves and…