Maths on the Back of an Envelope
Metadata
- Author: Rob Eastaway
- ASIN: B07Q1YY1C5
- ISBN: 0008444498
- Reference: https://amazon.co.uk/dp/B07Q1YY1C5
- Kindle link
Highlights
‘Harmony between horse and rider’ (yes, really). — location: 312
stfu this isn’t that weird
When the margin of error is larger than the figure you are quoting, there’s barely any justification in quoting the statistic at all, let alone to more than one significant figure. The best they can say is: ‘Unemployment probably fell slightly last month, perhaps by about 50,000.’ — location: 404
Whatever the growth rate (be that 1.2%, 4%, 10% or even 30%), the time it will take for the quantity in question to double can be found by dividing it into 72. With an interest rate of 4%, your money in the bank will double in 72 ÷ 4 = 18 years. — location: 1019