MATHEMATICS PROBLEM SOLVER

It is a site for parents, students and teachers. This site can help O-LEVEL or GCSE secondary school students in mastering mathematics subject. It intends to involve the learners by making them follow up the examples before they can do questions on their own at the TRY THIS.... section. There are some videos, tests, quizzes and past examination questions. Learning the examples will ultimately give students the required confidence in solving various questions in mathematics.

Tuesday 1 May 2018

PROBABILITY 2

A school survey found that 4 out of 10 students like pizza. If three students are chosen at random with replacement, what is the probability that all three students like pizza?

Solution

THIS IS AN INDEPENDENT EVENT. THE 1^ST CHOICE HAS NO ANY EFECT FOR THE 2^ND OR 3^RD.

P(student 1 likes pizza)	=	4
		10

P(student 2 likes pizza)	=	4
		10

P(student 3 likes pizza)	=	4
		10

P(student 1 and student 2 and student 3 like pizza)	=	4	·	4	·	4	=	8
		10		10		10		125

Hence probability that all three students like pizza is ⁸/125 .

TRY THIS………..

A school survey found that 3 out of 5 students like coffee. If three students are chosen at random with replacement, what is the probability that all three students like coffee?

MATHEMATICS PROBLEM SOLVER

Tuesday 1 May 2018

PROBABILITY 2

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