Christian Lawson-Perfect
Member of the e-learning unit in Newcastle University's School of Mathematics and Statistics.
Lead developer of Numbas.
I'm happy to answer any questions - email me.
Christian's activity
Christian Lawson-Perfect on Calculating Expected Values given a table of probabilities 8 years, 5 months ago
Saved a checkpoint:
This is a good question.
I've changed the titles of the films to randomly-generated ones because (a) they were a bit stereotypically boy-heavy and (b) they'll really date this question. There's also (c) are we allowed to use trademarks?
Christian Lawson-Perfect on Using compound units: price/weight of sweets 8 years, 5 months ago
Gave some feedback: Needs to be tested
Christian Lawson-Perfect on Using compound units: price/weight of sweets 8 years, 5 months ago
Saved a checkpoint:
I've changed the randomisation so that:
- the weight is an unrounded number
- the cost of the bag always ends in 9p.
- The cost per 100g is between 50p and £2, which feels more reasonable.
I've reworded the advice, and added a part asking to compare to a pick'n'mix price so that there's a reason for converting to price per 100g.
Christian Lawson-Perfect on Using compound units: price/weight of sweets 8 years, 5 months ago
Saved a checkpoint:
I've split the first two parts into separate questions.
Christian Lawson-Perfect on Using compound units - room hire price per hour and per minute 8 years, 5 months ago
Gave some feedback: Needs to be tested
Christian Lawson-Perfect on Using compound units - room hire price per hour and per minute 8 years, 5 months ago
Saved a checkpoint:
Split off from a bigger question but entirely rewritten. The original question asked to calculate someone's pay per hour as pay per minute, which I can't imagine ever wanting to do.
Christian Lawson-Perfect copied Using compound units: price/weight of sweets to Using compound units - room hire price per hour and per minute 8 years, 5 months ago
Christian Lawson-Perfect on Using compound units - speed 8 years, 5 months ago
Gave some feedback: Ready to use
Christian Lawson-Perfect on Using compound units - speed 8 years, 5 months ago
Saved a checkpoint:
Split off from a larger question.
Heavily edited the advice to make sure no weird rounding errors happen, and fixed a fair bit of grammar.
The question now picks a physically reasonable speed and generates a time based on that.