`10 20 31 ? 56 70.`

Find the mean of the marks obtained by 30 students of Class IX of aschool, given in Example 2.10 20 36 92 95 40 50 56 60 7092 88 80 70 72 70 36 40 36 4092 40 50 50 56 60 70 60 60 88

Find the mean of the marks obtained by 30 students of Class IX of a school, given in Example 2. 10 20 36 92 95 40 50 56 60 70 92 88 80 70 72 70 36 40 36 40 92 40 50 50 56 60 70 60 60 88

Consider the marks obtained (out of 100 marks) by 30 students of Class IX of a school: 10 20 36 92 95 40 50 56 60 70 92 88 80 70 72 70 36 40 36 40 92 40 50 50 56 60 70 60 60 88 Recall that the number of students who have obtained a certain number of marks is called the frequency of those marks. For instance, 4 students got 70 marks. So the frequency of 70 marks is 4. To make the data more easily understandable, tabulate the data.

Consider the marks obtained (out of 100 marks) by 30 students of Class IX of a school: 10 20 36 92 95 40 50 56 60 7092 88 80 70 72 70 36 40 36 4092 40 50 50 56 60 70 60 60 88 Recall that the number of students who have obtained a certain number of marks is called the frequency of those marks. For instance, 4 students got 70 marks. So the frequency of 70 marks is 4. To make the data more easily understandable, tabulate the data.

. -70 + 20 = ___ - 10

What is the median of the following list of numbers : 55,53,56,59,61,69, and 31 ? A. 55 B. 56 C. 59 D. 61

1, 2, 6, 15, 31, 56, 91 (a) 31 (b) 91 (c) 56 (d) 15

2, 6, 12, 20, 30, 42, 56, (......) (a) 60 (b) 64 (c) 72 (d) 70