Question: 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?
Options:
0.4
0.6
0.5
0.3
Correct Answer: 0.6
Solution:
The number of boys is 30 - 18 = 12. The probability is 12/30 = 0.4.
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?
0.4
0.6
0.5
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.
Probability Calculation – Understanding how to calculate the probability of an event by dividing the number of favorable outcomes by the total number of outcomes.
Complementary Counting – Using the total number of students and the number of girls to find the number of boys, which is essential for calculating the probability.
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