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Vidaara.orgClass 9 · Mathematics
CodeVID-M09-14-TAB-01
Collection & Presentation of Data - Assignment
Chapter: Statistics
Topic: Collection and Presentation of Data in Tabular Form
Maximum Marks: 35
Time: 75 minutes
Name: ____________________ Roll No.: __________ Date: ____________

General Instructions

  • All questions are compulsory.
  • Section A carries 1 mark each, Section B 2 marks, Section C 3 marks and Section D 5 marks.
  • Show all working for Sections B, C and D. Only final answers are given at the end — for full solutions, raise your doubts with your teacher.
Section A — Multiple Choice Questions 5 × 1 = 5 marks
1.
Unarranged data is called:
  • A.grouped
  • B.raw (ungrouped)
  • C.a histogram
  • D.a polygon
2.
The number of times a value occurs is its:
  • A.range
  • B.frequency
  • C.mean
  • D.mode
3.
The class mark $=$
  • A.upper $-$ lower
  • B.$\tfrac{\text{lower}+\text{upper}}{2}$
  • C.upper $+$ lower
  • D.lower limit
4.
The range $=$
  • A.highest $-$ lowest
  • B.highest $+$ lowest
  • C.mean value
  • D.class size
5.
The size of the class $30\text{--}40$ is:
  • A.$30$
  • B.$40$
  • C.$10$
  • D.$35$
Section B — Short Answer (2 marks) 4 × 2 = 8 marks
6.
Find the range of $5, 8, 12, 3, 20$.
7.
Find the class mark of $10\text{--}20$.
8.
Find the width of the class $30\text{--}40$.
9.
Find the frequency of $7$ in $7, 7, 3, 7, 2$.
Section C — Short Answer (3 marks) 4 × 3 = 12 marks
10.
Find the range of $45, 12, 78, 30, 60$.
11.
Find the class mark of $50\text{--}60$.
12.
In $2, 3, 2, 4, 3, 2$, how many times does $2$ appear?
13.
The classes are $0\text{--}10, 10\text{--}20, 20\text{--}30$. Find the class size.
Section D — Long Answer (5 marks) 2 × 5 = 10 marks
14.
The marks of $10$ students are $23, 45, 12, 36, 48, 30, 25, 41, 19, 33$. Find the range and the frequencies for classes $10\text{--}20, 20\text{--}30, 30\text{--}40, 40\text{--}50$.
15.
For classes $0\text{--}10, 10\text{--}20, 20\text{--}30, 30\text{--}40$ with frequencies $5, 8, 6, 1$, find the total observations and the class mark of each class.

Answer Key

Section A — Multiple Choice Questions
  1. (B) raw (ungrouped)
  2. (B) frequency
  3. (B) $\tfrac{\text{lower}+\text{upper}}{2}$
  4. (A) highest $-$ lowest
  5. (C) $10$
Section B — Short Answer (2 marks)
  1. $17$.
  2. $15$.
  3. $10$.
  4. $3$.
Section C — Short Answer (3 marks)
  1. $66$.
  2. $55$.
  3. $3$.
  4. $10$.
Section D — Long Answer (5 marks)
  1. Range $36$; frequencies $2, 2, 3, 3$.
  2. Total $20$; class marks $5, 15, 25, 35$.
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