The are 10 coloured balls in a bag, 4 red, 3 green, 2 orange and 1 yellow. John picks out balls and replaces them one at a time. What is the probability that the first two he picks are red?

The probability that John picks out a red ball is: The number of red balls divided by the total number of balls = 4/10
Because the balls are replaced, each event is independent so every time John picks out a ball the probability it is red is always 4/10. To determine the probability of two events both occurring we times their individual probabilities together.
Therefore the probability that the first two balls John picks out are red is: 4/10 X 4/10 = 16/100 which simplifies to 4/25

HT
Answered by Haroon T. Maths tutor

3577 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Solve x^2-5x+6=0


Simplify: 3(x+5)-4(2x+1)


Expand (2x-3)(4x+4) using the FOIL method.


The perimeter of a right-angled triangle is 72 cm. The lengths of its sides are in the ratio 3 : 4 : 5. Work out the area of the triangle.


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences