Question: In a class of 40 students, 25 are girls. What is the probability of selecting a boy?
Options:
0.375
0.625
0.5
0.25
Correct Answer: 0.625
Solution:
Number of boys = 40 - 25 = 15. Probability = 15/40 = 0.375.
In a class of 40 students, 25 are girls. What is the probability of selecting a
Practice Questions
Q1
In a class of 40 students, 25 are girls. What is the probability of selecting a boy?
0.375
0.625
0.5
0.25
Questions & Step-by-Step Solutions
In a class of 40 students, 25 are girls. What is the probability of selecting a boy?
Step 1: Identify the total number of students in the class, which is 40.
Step 2: Identify the number of girls in the class, which is 25.
Step 3: Calculate the number of boys by subtracting the number of girls from the total number of students: 40 - 25 = 15.
Step 4: Write down the number of boys, which is 15.
Step 5: To find the probability of selecting a boy, divide the number of boys by the total number of students: 15 / 40.
Step 6: Simplify the fraction 15 / 40 to get 0.375.
Probability Calculation – Understanding how to calculate the probability of an event by dividing the number of favorable outcomes by the total number of outcomes.
Basic Arithmetic – Performing simple subtraction and division to find the number of boys and the probability.
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