Question

A class consists of 21 boys and 9 girls . A student is to be selected for social work . Find the probability that i) A girl is seclected ii) A boy is secleted

Answer 1

Answer:

1) 3/10

2 7/10

Step-by-step explanation:

Probability is calculated by dividing no. of possible outcome by no. of total outcomes.

Answer 2

Step-by-step explanation:

Total number of students = 21 + 9

= 30 students.

Since, number of girls = 9.

$1) The \: probability \: that \: a \: girl \: is \: selected \: for \: social \: work= \frac{9}{30} = \frac{3}{10}$

Since, number of boys = 21 .

$2) \: The \: proability \: of \: getting \: a \: boy \: selected \: for \: social \: work \: = \frac{21}{30} = \frac{7}{10}$

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