Construct a table on marks in English secured by the students of Class X in your school in the house examination.

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Solution

Marks Obtained by Students of Class X in English

Marks Number of Students

20 − 30
30 − 40
40 − 50
50 − 60
60 − 70
70 − 80
80 − 90
90 − 100 5
10
12
14
20
13
9
3

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Q. In an examination 150 students secured first class in English or Mathematics. 115 students secured first class in Mathematics. How many students secured first class in English only?

Q. Construct a frequency table with class-intervals 0-5 (5 not included) of the following marks obtained by a group of 30 students in an examination.
0, 5, 7, 10, 12, 15, 20, 22, 25, 27, 8, 11, 17, 3, 6, 9, 17, 19, 21, 29, 31, 35, 37, 40, 42,45, 49, 4, 50, 16.

Q. Following are the marks obtained by 30 students in an examination :

15
16
44
27
7
37

20
17
47
25
11
47

8
20
38
28
21
23

9
24
36
30
31
20

10
30
40
19
41
17

Taking class intervals 0-10, 10-20, ..................., 40-50, construct a frequency table.

The following table shows marks secured by 140 students in an examination:
$\begin{matrix} M a r k s & N u m b e r o f s t u d e n t s 0 - 10 & 20 10 - 20 & 24 20 - 30 & 40 30 - 40 & 36 40 - 50 & 20 \end{matrix}$
Calculate mean marks by the step deviation method.

The following table shows marks secured by 140 students in an examination:
$\begin{matrix} Marks & Number of students 0 - 10 & 20 10 - 20 & 24 20 - 30 & 40 30 - 40 & 36 40 - 50 & 20 \end{matrix}$
Calculate mean marks by the step deviation method.

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Marks	Number of Students
20 − 30 30 − 40 40 − 50 50 − 60 60 − 70 70 − 80 80 − 90 90 − 100	5 10 12 14 20 13 9 3

Construct a table on marks in English secured by the students of Class X in your school in the house examination.

Marks Obtained by Students of Class X in English Marks Number of Students 20 − 30 30 − 40 40 − 50 50 − 60 60 − 70 70 − 80 80 − 90 90 − 100 5 10 12 14 20 13 9 3

Marks Obtained by Students of Class X in English

Marks Number of Students

20 − 30
30 − 40
40 − 50
50 − 60
60 − 70
70 − 80
80 − 90
90 − 100 5
10
12
14
20
13
9
3