Probability, SM-Bank 067

A bag of coloured balls contains 10 blue balls, 12 white balls, 5 black balls, 2 red balls, and 9 orange balls.

Joyce grabs a ball from the bag without looking what is inside.

What is the probability that she grabs an white ball? (1 mark)

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\(\dfrac{6}{19}\)

Show Worked Solution

\(P\text{(White ball)}\)	\(=\dfrac{\text{Total white balls}}{\text{Total balls}}\)
	\(=\dfrac{12}{10+12+5+2+9}\)
	\(=\dfrac{12}{38}\)
	\(=\dfrac{6}{19}\)