The marks obtained by 50 students in a test are tabulated below :
| Marks : | 0 - 15 | 15 - 30 | 30 - 45 | 45 - 60 | 60 - 75 |
|---|---|---|---|---|---|
| Number of students : | 3 | 9 | 20 | 15 | 3 |
The number of students who got less than 45 marks is :
Get the complete, step-by-step math solution for: "The marks obtained by 50 students in a test are tabulated below : | Marks : | 0 - 15 | 15 - 30 | 30 - 45 | 45 - 60 | 60 - 75 | |---|---|---|---|---|--...". Powered by SolveForX AI math tutor.
Step-by-Step Solution
Step 1: Identify relevant classes
To find the number of students who scored less than 45 marks, we need to consider all the classes where the upper limit is less than or equal to 45. These classes are 0-15, 15-30, and 30-45.
Step 2: Sum the frequencies
Now, we sum the number of students (frequencies) corresponding to each of these identified classes. For the 0-15 class, there are 3 students. For the 15-30 class, there are 9 students. For the 30-45 class, there are 20 students.
Step 3: Calculate the total
Adding these frequencies together, 3+9+20, gives us the total number of students who scored less than 45 marks.