Question 61
What is the probability that a student chosen at random out of 3 girls and 4 boys is a boy?

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Solution

Given, total children = 7, 4 boys and 3 girls.
So, favourable outcomes for a boy = Number of boys = 4
Total number of possible outcomes = 7
$∴ P r o b a b i l i t y = \frac{F a v o u r a b l e o u t c o m e s}{T o t a l n u m b e r o f p o s s i b l e o u t c o m e s} = \frac{4}{7}$

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Chance and Probability

Standard VII Mathematics

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Question 61 What is the probability that a student chosen at random out of 3 girls and 4 boys is a boy?

Given, total children = 7, 4 boys and 3 girls. So, favourable outcomes for a boy = Number of boys = 4 Total number of possible outcomes = 7 ∴Probability=Favourable outcomesTotal number of possible outcomes=47

Question 61
What is the probability that a student chosen at random out of 3 girls and 4 boys is a boy?

Given, total children = 7, 4 boys and 3 girls.
So, favourable outcomes for a boy = Number of boys = 4
Total number of possible outcomes = 7
$∴ P r o b a b i l i t y = \frac{F a v o u r a b l e o u t c o m e s}{T o t a l n u m b e r o f p o s s i b l e o u t c o m e s} = \frac{4}{7}$