Skip to main content
law of averages

law of averages

1 3.9
The idea that after many tries results tend to match what is expected on average
  • noun
  • /lɔː əv ˈævərɪdʒɪz/
translation icon : ley de promedios

Examples

  • Police work's all about the law of averages.

  • The law of averages caught up with you.

  • The law of averages says you will survive.

  • It is the law of averages, and it just goes to show that when you poll any sizable population of folks, they will not agree on anything 100%.

    Blog text (4)
  • According to the law of averages, if you keep practicing, you will eventually improve your skills.

  • The law of averages suggests that if you flip a coin multiple times, the number of heads and tails will balance out over time.

  • He believed in the law of averages, thinking that after losing several times, his luck would surely turn around.

Synonyms

law of large numbers
vslaw of averages
  • Specialized
1 5.9

When a sample gets larger, its average gets closer to the average of the whole group

is an informal idea that outcomes approach expected average over many tries
Bernoulli's law
vslaw of averages
  • Specialized
9.5

The average of a large random sample gets close to the true value for the whole group

is a nontechnical version saying results tend toward expected averages after many trials
strong law of large numbers
vslaw of averages
  • Specialized
9.1

The average of many separate random results becomes almost always close to the true average

is the informal idea without the strict mathematical guarantee of almost sure convergence
Kolmogorov's strong law of large numbers
vslaw of averages
  • Specialized
9.9

A theorem that says the average of many independent random results almost certainly equals the true average

is the everyday belief without technical conditions or formal proof

Surface Forms

Morphology

law + of + average

The phrase names a rule or principle about ‘averages’ built from the literal constituents: 'law' (a rule) + 'of averages' (about average outcomes), so the meaning is directly inferable as a rule concerning averages. This compositional noun phrase follows normal English patterns and is cross-linguistically transparent, so a B1 learner who knows the parts should understand it.

Etymology

Law of averages may come from old gamblers and people who counted many results and saw that, after many tries, the numbers tended to move toward the usual amount. People treated that idea like a rule (a law) about the averages, so law of averages means believing that, over many tries, things will 'even out' or 'match the average'.