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In a class of 30 students, 18 are boys and 12 are girls. If one student is selec

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Question: In a class of 30 students, 18 are boys and 12 are girls. If one student is selected at random, what is the probability that the student is a girl?

Options:

  1. 2/5
  2. 1/3
  3. 1/2
  4. 3/5

Correct Answer: 2/5

Solution: 

Probability = Number of girls / Total students = 12/30 = 2/5.

In a class of 30 students, 18 are boys and 12 are girls. If one student is selec

Practice Questions

Q1
In a class of 30 students, 18 are boys and 12 are girls. If one student is selected at random, what is the probability that the student is a girl?
  1. 2/5
  2. 1/3
  3. 1/2
  4. 3/5

Questions & Step-by-Step Solutions

In a class of 30 students, 18 are boys and 12 are girls. If one student is selected at random, what is the probability that the student is a girl?
  • Step 1: Identify the total number of students in the class. There are 30 students.
  • Step 2: Identify the number of girls in the class. There are 12 girls.
  • Step 3: Write the formula for probability. Probability = (Number of girls) / (Total number of students).
  • Step 4: Substitute the numbers into the formula. Probability = 12 / 30.
  • Step 5: Simplify the fraction 12/30. Both numbers can be divided by 6, which gives 2/5.
  • Step 6: Conclude that the probability of selecting a girl is 2/5.
  • Probability – The likelihood of an event occurring, calculated as the ratio of favorable outcomes to the total number of outcomes.
  • Basic Counting – Understanding how to count the total number of students and the number of girls in the class.
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