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Standard IX

Mathematics

Class Interval

Class Interva...

Question

Class Interval Frequency
10-20 5
20-30 10
30-40 4
40-50 13
50-60 8
60-70 3
70-80 8
80-90 9
90-100 11
From the table above, identify the class interval for the fifth class.

5

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11

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12

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10

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Solution

The correct option is D $10$
For the fifth class, $50 - 60$
The class interval $=$ Upper class boundary $-$ Lower class boundary
Upper class boundary $= 60.5$
Lower class boundary $= 50.5$
Therefore, the class interval $= 60.5 - 50.5 = 10$

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Similar questions

Q. The marks obtained by 40 students of a class are given below :

80, 10, 30, 70, 60, 50, 50, 40, 40, 20, 40, 90, 50, 30, 70, 10, 60, 50, 20, 70, 70, 30, 80, 40, 20, 80, 90,

50, 80, 60, 70, 40, 50, 60, 90, 60, 40, 40, 60

, and

60

Construct a frequency distribution table.

Q. Identify the median class from the given data

:

Fruits	$30 - 40$	$40 - 50$	$50 - 60$	$60 - 70$	$70 - 80$	$80 - 90$	$90 - 100$
Boxes	$1$	$3$	$6$	$7$	$8$	$5$	$7$

Q. The marks obtained by 40 students of a class are given below :

80, 10, 30, 70, 60, 50, 50, 40, 40, 20, 40, 90, 50, 30, 70, 10, 60, 50, 20, 70, 70, 30, 80, 40, 20, 80,

90, 50, 80, 60, 70, 40, 50, 60, 90, 60, 40, 40, 60

, and

60

How many students obtained marks below

40

The marks obtained by $40$ students of a class are given below :
$80, 10, 30, 70, 60, 50, 50, 40, 40, 20, 40, 90, 50, 30, 70,$
$10, 60, 50, 20, 70, 70, 30, 80, 40, 20, 80, 90,$ $50, 80,$
$60, 70, 40, 50, 60, 90, 60, 40, 40, 60$ , and $60$

How many numbers are less than

35

Identify the modal class:

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Class Interval	Frequency
10-20	5
20-30	10
30-40	4
40-50	13
50-60	8
60-70	3
70-80	8
80-90	9
90-100	11

Class IntervalFrequency 10-205 20-30 10 30-40 4 40-50 13 50-60 8 60-70 3 70-80 8 80-90 9 90-100 11 From the table above, identify the class interval for the fifth class.

The correct option is D 10For the fifth class, 50−60The class interval = Upper class boundary − Lower class boundaryUpper class boundary =60.5Lower class boundary =50.5Therefore, the class interval =60.5−50.5=10

Class Interval Frequency
10-20 5
20-30 10
30-40 4
40-50 13
50-60 8
60-70 3
70-80 8
80-90 9
90-100 11
From the table above, identify the class interval for the fifth class.

The correct option is D $10$
For the fifth class, $50 - 60$
The class interval $=$ Upper class boundary $-$ Lower class boundary
Upper class boundary $= 60.5$
Lower class boundary $= 50.5$
Therefore, the class interval $= 60.5 - 50.5 = 10$