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Properties of Measures of Central Tendency

What is the c...

Question

What is the class mark of a class $a - b$

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Solution

Class mark $= \frac{a + b}{2} .$

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What is the difference between the Overall average marks of class A and class B in the 9 subjects?

Q. Marks of the students of different classes are represented in the table given below :-

Classes	Marks Arrangement
Class A	54 , 69 , 78 , 89 , 43 , 32
Class B	32 , 43 , 54 , 69 , 78, 89
Class C	89 , 78 , 69 , 54 , 43 , 32

Which class(es) has/have the best way of arranging the marks of students?

Q. Average marks of the students of Class A is of 68. If Class B consisting of students having an average 72 joins them, then the average marks of A & B becomes 69.33. If Class C consisting of a few students having an average mark of 65 joins Class A, then average marks of A & C becomes 66.2. What will be the combined average mark of class B and class C?___

Q. Marks of the students of different classes are represented in the table given below. Which class(es) has/have the best way of arranging the marks of students?

\begin{matrix} Classes & Marks Arrangement Class A & 54, 69, 78, 89, 43, 32 Class B & 32, 43, 54, 69, 78, 89 Class C & 89, 78, 69, 54, 43, 32 \end{matrix}

Q. (a)The class interval having highest frequency is-
(b)The class-mark of class 50-60 is-
(c)The size of each class intervals is-

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Properties of Measures of Central Tendency

Standard IX Mathematics

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