Final answer:
To find the mean marks obtained by class 10 students, add all the marks together (75 + 80 + 85 + 90 + 95 = 425) and divide by the number of marks (5). The mean is 425 / 5 = 85, which is option (a).
Step-by-step explanation:
To find the mean marks obtained by the students, we need to add up all the marks and divide the sum by the number of students. In this case, there are 5 students and their marks are 75, 80, 85, 90, and 95. Adding these up, we get 425. Now, we divide 425 by 5 to get the mean marks. The mean marks obtained by the students in this case is 85.
The question asks to calculate the mean marks obtained by class 10 students in their half-yearly examinations. To find the mean, we sum all the marks and then divide by the number of marks. The marks given are 75, 80, 85, 90, 95.
The sum of the marks is:
Sum = 75 + 80 + 85 + 90 + 95 = 425
Since there are 5 sets of marks, we divide by 5:
Mean = Sum / Number of marks
Mean = 425 / 5 = 85
Therefore, the mean marks obtained by the students is 85, which corresponds to option (a).