4400 Higher November 2004 Paper 4 Q4

EdexcelHigherOld spec3 marksBasic Probability

4 Here is a 4-sided spinner.

A 4-sided spinner with sides labelled 1, 2, 3 and 4

The sides of the spinner are labelled 1, 2, 3 and 4.
The spinner is biased.
The probability that the spinner will land on each of the numbers 1, 2 and 3 is given in the table.

Number	1	2	3	4
Probability	0.2	0.1	0.4

(a) Work out the probability that the spinner will land on 4 (2)

Tom spun the spinner a number of times.
The number of times it landed on 1 was 85

(b) Work out an estimate for the number of times the spinner landed on 3 (1)

Scheme	Marks
1 − (0.2 + 0.1 + 0.4)	M1
0.3	A1
	(2)

Scheme	Marks
170	B1
	(1)
	(3 marks)

Notes