His team is building a talent mapping database using Neo4j technology to build a knowledge graph to show the relationships between people, skills, and projects.

You can use the Frequency function within Excel in Microsoft Office 2011 for the Macintosh platform to calculate the frequency of data that lies within a certain range.

Find out how to solve simultaneous equations using a graph in this Bitesize KS3 maths video.

The resulting data and graph are shown below. The frequency is derived from the data using this formula: frequency = 300,000,000 m/s / (2 * half-wavelength measurement) ...