Question

a class consists of 30 boys and 10 girls the probability of that a girl selected at random is​

Answer 1

n(g) = selection of 1 girl = 10c1 = 10

n(t) = selection of 1 person out of total = (30+10)c1

= 40

p(g) = 10/40 =1/4

Answer 2

Answer:

The probability that a girl is selected at random is 0.25

Step-by-step explanation:

The probability of an event is given by,

Probability = $\frac{favourable\ outcomes}{total\ possible \ outcomes}$

Given that the class consists of 30 boys and 10 girls. So the total number of students in the class is given by,

Total = 30+10= 40 students

So the probability of selecting a girl at random is,

Probability = $\frac{Number\ of\ girls}{Total \ number\ of\ students} =\frac{10}{40}= \frac{1}{4}=0.25$

So the probability that a girl is selected at random is 0.25