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In a class of 30 students, 18 are girls. If a student is selected at random, wha

Practice Questions

Q1
In a class of 30 students, 18 are girls. If a student is selected at random, what is the probability that the student is a boy?
  1. 0.4
  2. 0.6
  3. 0.5
  4. 0.3

Questions & Step-by-Step Solutions

In a class of 30 students, 18 are girls. If a student is selected at random, what is the probability that the student is a boy?
Correct Answer: 0.4
  • Step 1: Identify the total number of students in the class, which is 30.
  • Step 2: Identify the number of girls in the class, which is 18.
  • Step 3: Calculate the number of boys by subtracting the number of girls from the total number of students: 30 - 18 = 12.
  • Step 4: Write the probability of selecting a boy as the number of boys divided by the total number of students: 12/30.
  • Step 5: Simplify the fraction 12/30 to get 0.4.
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