Historical estimate
A year without a breakdown or non-start for a recent car
- Probability:
- 95.1%
- Odds:
- 19 to 1
- dBan
- +12.9 dBan
In the 2021 Which? UK Car Survey, 95.1% of cars aged up to four years had no breakdown or non-start during the preceding 12 months, about 19 without one for every car that had one.
Calculation
p ≈ 1 − 0.049 = 0.951 without a breakdown or non-start
Assumptions
This retrospective survey result covers UK cars aged 0–4 years in 2021. The whole survey included 48,034 respondents reporting on 56,853 cars. The published article does not give the age group’s separate sample size. The annual result is not a per-trip rate and does not describe all car ages or current reliability.
Sources
- Which?: 2021 UK Car Survey reliability findings 48,034 respondents and 56,853 cars overall, published 3 March 2022