Skip to content

Course home

4.4.1 Probability (A-level only)

4.4.1 Probability (A-level only)

EasyMediumHard
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109
Question 79

The operating lifespan, LLL cycles, of Titan-X high-performance drone batteries is normally distributed with a mean of 450450450 cycles and a standard deviation of 404040 cycles.

a.

Find the probability that a randomly selected Titan-X battery lasts for more than 530530530 cycles.

[2]
b.

Batteries that exceed a lifespan of 530530530 cycles are designated as "Elite".

A battery is selected at random. Given that it is designated as Elite,

determine the probability that its lifespan exceeds 550550550 cycles.

[3]
c.

Within the Elite category, exactly 15%15\%15% of batteries have a lifespan exceeding kkk cycles.

Find the value of kkk.

[3]
Markscheme

4.4.1 Probability (A-level only) Questions

  1. A Level
  2. /Maths
  3. /4.4.1 Probability (A-level only)

140 exam-style questions on CCEA A Level Maths 4.4.1 Probability (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

Question bank