Question: In a class of 30 students, 18 are boys. What is the probability of randomly selecting a girl?
Options:
0.4
0.6
0.5
0.3
Correct Answer: 0.4
Solution:
Number of girls = 30 - 18 = 12. Probability = 12/30 = 0.4.
In a class of 30 students, 18 are boys. What is the probability of randomly sele
Practice Questions
Q1
In a class of 30 students, 18 are boys. What is the probability of randomly selecting a girl?
0.4
0.6
0.5
0.3
Questions & Step-by-Step Solutions
In a class of 30 students, 18 are boys. What is the probability of randomly selecting a girl?
Correct Answer: 0.4
Step 1: Identify the total number of students in the class, which is 30.
Step 2: Identify the number of boys in the class, which is 18.
Step 3: Calculate the number of girls by subtracting the number of boys from the total number of students: 30 - 18 = 12.
Step 4: Write down the number of girls, which is 12.
Step 5: To find the probability of selecting a girl, divide the number of girls by the total number of students: 12 / 30.
Step 6: Simplify the fraction 12 / 30 to get 0.4.
Probability Calculation – Understanding how to calculate the probability of an event by determining the ratio of favorable outcomes to total outcomes.
Complementary Counting – Using the total number of students to find the number of girls by subtracting the number of boys from the total.
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