(A) To find the frequency of the class interval $30-40$, we subtract the number of students who scored more than or equal to $40$ from the number of s

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(A) To find the frequency of the class interval $30-40$, we subtract the number of students who scored more than or equal to $40$ from the number of students who scored more than or equal to $30$.Frequency of class $30-40 = (\text{Number of students } \ge 30) - (\text{Number of students } \ge 40)$Frequency of class $30-40 = 51 - 48 = 3$.Thus, the frequency of the class $30-40$ is $3$.

Class 10 Mathematics Statistics Mean of Grouped Data

Easy

Consider the following distribution:
Marks obtained Number of students
More than or equal to $0$ $63$
More than or equal to $10$ $58$
More than or equal to $20$ $55$
More than or equal to $30$ $51$
More than or equal to $40$ $48$
More than or equal to $50$ $42$

The frequency of the class $30-40$ is:

A
$3$
B
$4$
C
$5$
D
$6$

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Class 10

Mathematics Questions

Chapter

Statistics

Subtopic

Mean of Grouped Data

The mean of the following frequency distribution is $43.75$. Find the missing frequency $f$.
Class $0-10$ $10-20$ $20-30$ $30-40$ $40-50$ $50-60$ $60-70$ $70-80$ $80-90$ $90-100$
Frequency $8$ $4$ $20$ $45$ $64$ $32$ $f$ $8$ $2$ $2$

Medium

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The mean of $15$ observations is $16$. If $2$ is added to each observation and then each result is divided by $3$,the new mean is:

Medium

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Calculate the mean of the frequency distribution of the marks scored by $100$ students in a mathematics test:

Marks $0-10$ $10-20$ $20-30$ $30-40$ $40-50$

No. of students $20$ $10$ $20$ $30$ $20$

Medium

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Find the mean of the following frequency distribution:

Class $10-20$ $20-30$ $30-40$ $40-50$ $50-60$ $60-70$

Frequency $2$ $10$ $40$ $25$ $13$ $10$

(in $.7$)

Medium

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The mean of $5$ observations is $16$. If an observation $5$ is replaced by $-5$,the new mean is ...........

Medium

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Marks obtained	Number of students
More than or equal to $0$	$63$
More than or equal to $10$	$58$
More than or equal to $20$	$55$
More than or equal to $30$	$51$
More than or equal to $40$	$48$
More than or equal to $50$	$42$

Class	$0-10$	$10-20$	$20-30$	$30-40$	$40-50$	$50-60$	$60-70$	$70-80$	$80-90$	$90-100$
Frequency	$8$	$4$	$20$	$45$	$64$	$32$	$f$	$8$	$2$	$2$

Marks	$0-10$	$10-20$	$20-30$	$30-40$	$40-50$
No. of students	$20$	$10$	$20$	$30$	$20$

Consider the following distribution:Marks obtainedNumber of studentsMore than or equal to $0$$63$More than or equal to $10$$58$More than or equal to $20$$55$More than or equal to $30$$51$More than or equal to $40$$48$More than or equal to $50$$42$The frequency of the class $30-40$ is:

Similar Questions

The mean of the following frequency distribution is $43.75$. Find the missing frequency $f$.Class$0-10$$10-20$$20-30$$30-40$$40-50$$50-60$$60-70$$70-80$$80-90$$90-100$Frequency$8$$4$$20$$45$$64$$32$$f$$8$$2$$2$

The mean of $15$ observations is $16$. If $2$ is added to each observation and then each result is divided by $3$,the new mean is:

Calculate the mean of the frequency distribution of the marks scored by $100$ students in a mathematics test: Marks $0-10$ $10-20$ $20-30$ $30-40$ $40-50$ No. of students $20$ $10$ $20$ $30$ $20$

Find the mean of the following frequency distribution: Class $10-20$ $20-30$ $30-40$ $40-50$ $50-60$ $60-70$ Frequency $2$ $10$ $40$ $25$ $13$ $10$ (in $.7$)

The mean of $5$ observations is $16$. If an observation $5$ is replaced by $-5$,the new mean is ...........

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The mean of the following frequency distribution is $43.75$. Find the missing frequency $f$.
Class $0-10$ $10-20$ $20-30$ $30-40$ $40-50$ $50-60$ $60-70$ $70-80$ $80-90$ $90-100$
Frequency $8$ $4$ $20$ $45$ $64$ $32$ $f$ $8$ $2$ $2$

Calculate the mean of the frequency distribution of the marks scored by $100$ students in a mathematics test:

Marks $0-10$ $10-20$ $20-30$ $30-40$ $40-50$

No. of students $20$ $10$ $20$ $30$ $20$

Find the mean of the following frequency distribution:

Class $10-20$ $20-30$ $30-40$ $40-50$ $50-60$ $60-70$

Frequency $2$ $10$ $40$ $25$ $13$ $10$

(in $.7$)