Skip to content

Course home

Sign up

2 Unit 2: Applied Mathematics A

EasyMediumHard
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157
Question 48

The masses, x x\,x kg, of 40 cars have mean 1420 kg and standard deviation 180 kg. The masses are coded using

y=x−100020\displaystyle y = \frac{x - 1000}{20}y=20x−1000​

a.

Find the mean and the standard deviation of the coded values.

[3]
b.

The median of the coded values is 20.5. Find the median mass.

[1]
c.

Explain why the standard deviation of the coded values is smaller than 180.

[1]
Markscheme

2 Unit 2: Applied Mathematics A Questions

  1. A Level
  2. /Maths
  3. /2 Unit 2: Applied Mathematics A

Question bank