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

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Question: In a class of 30 students, 18 are boys and 12 are girls. If a 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: 

The probability of selecting a girl is the number of girls divided by the total number of students, which is 12/30 = 2/5.

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

Practice Questions

Q1
In a class of 30 students, 18 are boys and 12 are girls. If a 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 a student is selected at random, what is the probability that the student is a girl?
Correct Answer: 2/5
  • 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: To find the probability of selecting a girl, use the formula: 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 us 2/5.
  • Step 6: The final answer is that the probability of selecting a girl is 2/5.
  • Probability – The likelihood of an event occurring, calculated as the number of favorable outcomes divided by the total number of possible outcomes.
  • Ratio – A comparison of two quantities, in this case, the number of girls to the total number of students.
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