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 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.

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.

The marks in science of 80 students of class X are given below: Find the mode of the marks obtained by the students in science. Marks: 0-10 10-20 20-30 30-40 40-50 50-60 60-70 70-80 80-90 90-100 Frequency: 3 5 16 12 13 20 5 4 1 1

Following are the marks obtained, out of 100, by two students Ravi and Hashina in 10 life? Ravi: 25 50 45 30 70 42 36 48 35 60 Hashina: 10 70 50 20 95 55 42 60 48 80 .Who is more intelligent and who is more consistent?

The following table gives the marks scored by 378 students in an entrance examination : Marks 0-10 10-20 20-30 30-40 40-50 50-60 60-70 70-80 80-90 90-100 No. of Students 3 12 36 76 97 85 39 12 12 6 From this table form (i) less than series, and (ii) the more than series.

Find the mode of the following distribution: (i) Class-interval: 0-10 10-20 20-30 30-40 40-50 50-60 60-70 70-80 Frequency: 5 8 7 12 28 20 10 10

The following table gives the marks scored by 100 students in an entrance examination. Marks: 0-10 10-20 20-30 30-40 40-50 50-60 60-70 70-80 No. of Students (Frequency): 4 10 16 22 20 18 8 2 Represent this data in the form of a histogram.

Following table shows the marks scored by a group of 90 students in a mathematics test of 100 marks. Marks 0-20 20-30 30-40 40-50 50-60 60-70 70-100 No. of Students: 7 10 10 20 20 15 8 Find the probability that marks scored by a student in the class is: at most 60 marks (ii) at least 60 marks (iii)not more than 50 marks