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Question From class 9 Chapter PROBABILITY

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

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
3:57
A teacher wanted to analysis the performance of two sections of students in a mathematics test of 100 marks. Looking performance, she found that a few students got under 20 marks and a few got 70 marks or above. So she decided to group them into intervals of varying sizes as follows : <br> 0-20, 20-30, ....., 60-70, 70-100. Then she formed the following table : <br> <br> (i) Find the probability that a student obtained less than in the mathematics test. <br> (ii) Find the probability that a student obtained marks 60 or above .
2:44
The marks scored by 20 students in a test are given below: 54,42,68,56,62,71,78,51,72,53,44,58,47,64,41,57,89,53,87,57. Complete the following frequency table: Marks in class intervals, Tally marks, Frequency (No. of children 40-50 50-60 60-70 70-80 80-90, , What is the class interval in which the greatest frequency occurs?
3:16
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.
3:16
Calculate the median from the following data: Marks below:       10   20   30   40   50     60     70     80 No. of students:    15   35   60   84   96    127   198   250
2:33
The following table shows the number of marks secured by the students of a class in a 50 marks exam. <br> <br> How many students secured less then or equal to 30 marks in that exam ?
Marks obtained by 7 students in a subject are 30, 55, 75, 90, 50, 60, 39. The number of students securing marks less than the mean marks is
50 ??????? ?? ????? ??? ???? 70% ??? ??????? ??? ?? ? ????? 25 ??????? ?? ???? 60% ??? ??????? ??? ?? 24 ??????? ?? ???? 80% ??? ??????? ???? ????? ????? ?? ????? ??? ??????? ??? ?
3:00
The following table shows marks secured by the students of a class in an examination in English: <br> <br> Calculte mean marks using Short-cut Method.
7:02
The following table shows marks secured by the students of a class in an examination in English: <br> <br> Calculte mean marks using Short-cut Method.
The table given below shows the marks obtained by 80 students of a class in a test with maximum marks 100 . <br> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/RSA_MATH_IX_C19_SLV_018_Q01.png" width="80%"> <br> A student of the class is selected at random . <br> Find the probability that he gets <br> (i) less than 15% marks , (ii) 60 or more marks and <br> (iii) less than 45 marks .
The following table shows marks in English secured by students of Class X in your school in their examination. Calculate mean marks using Direct Method. <br>
5:30
The following table shows marks in English secured by students of Class X in your school in their examination. Calculate mean marks using Direct Method. <br>
Convert the following cumulative frequency series into a simple frequency series. <br> 4 students obtained less than 10 marks <br> 20 students obtained less than 20 marks <br> 40 students obtained less than 30 marks <br> 48 students obtained less than 40 marks <br> 50 students obtained less than 50 marks
10:21
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
1:27

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