Skip to content

Course home

Sign up

4.2 Statistical distributions (A-level only)

EasyMediumHard
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138
Question 44

In a manufacturing facility for precision sensors, the probability of a sensor having a calibration error is p=0.12p = 0.12p=0.12. Errors occur independently in each sensor.

a.

Find the probability that in a random sample of 25 sensors, there will be

(i) exactly 4 sensors with a calibration error,

(ii) at least 6 sensors with a calibration error.

[4]
b.

In a large batch of 600 sensors, use a suitable approximation to find the probability that the number of sensors with calibration errors is more than 80.

[5]
Markscheme

4.2 Statistical distributions (A-level only) Questions

  1. A Level
  2. /Maths
  3. /4.2 Statistical distributions (A-level only)

324 exam-style questions on WJEC A Level Maths 4.2 Statistical distributions (A-level only), covering 4.2.1 Statistical distributions (A-level only), 4.2.2 Statistical distributions (A-level only), and 4.2.3 Statistical distributions (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

Question bank