The data given below shows the marks obtained by various students.
|
Marks |
Number of students |
|
10-12 |
6 |
|
12-14 |
8 |
|
14-16 |
5 |
|
16-18 |
7 |
|
18-20 |
4 |
What is the mean marks (Correct up to two decimal places) of given data?
Answer & explanation
Correct answer: option 3
Total number of students = 6 + 8 + 5 + 7 + 4 = 30
Mean marks = \(\frac{11×6 + 13 × 8 + 15×5 + 17×7 + 19×4}{30}\)
= \(\frac{66 + 104+ 75 + 119 + 76}{30}\)
= \(\frac{ 440}{30}\)
= 14.67