Math, asked by boyarevulavarsha, 16 days ago

if a student got marks in a test 40 50 60 70 75 65 what is his mean mark please with explaination​

Answers

Answered by kaladayatk
0

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

Answered by jcknife720
0

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

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