The following are the marks obtained in Maths by students of Class 8:
51, 94, 34, 20, 50, 81, 81, 90, 76, 34, 51, 86, 93, 99, 26, 54, 85, 71, 88, 40, 44, 56, 55, 57, 78, 53, 81, 78, 65, 78.

Group the data and find out how many students scored between 60 and 70.

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Solution

The correct option is A 1
Arrange the given data in the form of a continuous frequency distribution table.

$\begin{matrix} C l a s s i n t e r v a l & F r e q u e n c y (f_{i}) 20 - 30 & 2 30 - 40 & 2 40 - 50 & 2 50 - 60 & 8 60 - 70 & 1 70 - 80 & 5 80 - 90 & 6 90 - 100 & 4 \end{matrix}$

From the frequency distribution table, one can infer that, the number of student who scored between 60 and 70 is 1.

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Q. The following are the marks obtained in Maths by students of Class 8:
51, 94, 34, 20, 50, 81, 81, 90, 76, 34, 51, 86, 93, 99, 26, 54, 85, 71, 88, 40, 44, 56, 55, 57, 78, 53, 81, 78, 65, 78.

Group the data and find out how many students scored between 60 and 70?

In a class of five students, the table shows the marks obtained by 5 students in Maths,

Physics and Chemistry. Find the answer of following questions.

a) Which roll no. secured maximum marks?

b) Are there any students who scored equal marks?

c) Who got least aggregate marks?

d) How much marks scored by roll no. 4?

$\begin{matrix} R o l l N o . & M a t h s & P h y s i c s & C h e m i s t r y 1 & 67 & 78 & 67 2 & 57 & 78 & 75 3 & 78 & 64 & 72 4 & 84 & 60 & 69 5 & 69 & 70 & 73 \end{matrix}$

[4 MARKS]

The following are the marks obtained in Maths by students of Class 8:
51, 94, 34, 20, 50, 81, 81, 90, 76, 34, 51, 86, 93, 99, 26, 54, 85, 71, 88, 40, 44, 56, 55, 57, 78, 53, 81, 78, 65, 78.
The data have to be grouped to find the mean marks.
One of the class intervals made is 60-70.
How many should such class intervals be prepared?
What is the frequency of the last class interval?
What is $\sum f_{i}$ ?

The following are the marks obtained in Maths by students of Class 8:
51, 94, 34, 20, 50, 81, 81, 90, 76, 34, 51, 86, 93, 99, 26, 54, 85, 71, 88, 40, 44, 56, 55, 57, 78, 53, 81, 78, 65, 78.
The data have to be grouped to find the mean marks. One of the class intervals made is 60-70.

What is the frequency of the last class interval?

Q. The marks obtained by 25 students in a science test are given below. (Marks out of 30)

\begin{matrix} 8 & 7 & 12 & 17 & 20 & 11 & 10 & 10 & 16 \\ 21 & 28 & 25 & 13 & 9 & 27 & 18 & 20 & 19 \\ 7 & 29 & 16 & 15 & 20 & 22 & 27 \end{matrix}

Using this data, answer the following questions:

(1) What is the lowest score obtained?
(2) How many students have obtained this lowest score?
(3) How many students have obtained 20 marks?
(4) What is the frequency of the score 27?
(5) How many students have scored more than 20 marks?

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The following are the marks obtained in Maths by students of Class 8: 51, 94, 34, 20, 50, 81, 81, 90, 76, 34, 51, 86, 93, 99, 26, 54, 85, 71, 88, 40, 44, 56, 55, 57, 78, 53, 81, 78, 65, 78. Group the data and find out how many students scored between 60 and 70. 1

The following are the marks obtained in Maths by students of Class 8:
51, 94, 34, 20, 50, 81, 81, 90, 76, 34, 51, 86, 93, 99, 26, 54, 85, 71, 88, 40, 44, 56, 55, 57, 78, 53, 81, 78, 65, 78.

Group the data and find out how many students scored between 60 and 70.

1