if a student got marks in a test 40 50 60 70 75 65 what is his mean mark please with explaination
Answers
Answer:
Here we have, the cumulative frequency distribution. So, first we convert it into an ordinary frequency distribution. we observe that are 80 students getting marks greater than or equal to 0 and 77 students have secured 10 and more marks. Therefore, the number of students getting marks between 0 and 10 is 80-77= 3.
Similarly, the number of students getting marks between 10 and 20 is 77-72= 5 and so on. Thus, we obtain the following frequency distribution.
Marks Number of students
0-10 3
10-20 5
20-30 7
30-40 10
40-50 12
50-60 15
60-70 12
70-80 6
80-90 2
90-100 8
Now, we compute mean arithmetic mean by taking 55 as the assumed mean.
Computative of Mean
Answer:
His mean marks = 60
Step-by-step explanation:
No. of subjects = 6
Total sum of the marks = 40+50+60+70+75+65
= 360
Therefore, his mean marks = 360÷6
= 60