The document RD Sharma Solutions (Part - 2)- Ex-22.1, Data Handling I Collection Organisation Data, Class 7 Class 7 Notes | EduRev is a part of the Class 7 Course RD Sharma Solutions for Class 7 Mathematics.

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**In a study of number of accidents per day, the observations for 30 days were obtained as follows:**

**Prepare a frequency distribution table.**

Required frequency-distribution table:

Number of Accidents | Number of Days |

0 | 2 |

1 | 3 |

2 | 6 |

3 | 3 |

4 | 4 |

5 | 6 |

6 | 6 |

**Prepare a frequency table of the following ages (in years) of 30 students of class VIII in your school:**

13, 14, 13, 12, 14, 13, 14, 15, 13, 14, 13, 14, 16, 12, 1413, 14, 15, 16, 13, 14, 13, 12, 17, 13, 12, 13, 13, 13, 14 |

Frequency Distribution Table is :

Ages (in years) | Number of Students |

12 | 4 |

13 | 12 |

14 | 9 |

15 | 2 |

16 | 2 |

17 | 1 |

**Following figures relate the weekly wages (in Rs.) of 15 workers in a factory:**

300, 250, 200, 250, 200, 150, 350, 200, 250, 200, 150, 300, 150, 200, 250 |

**Prepare a frequency table. (i) What is the range in wages (in Rs)? (ii) How many Workers are getting Rs 350? (iii) How many workers are getting the minimum wages?**

Frequency Distribution Table is

Wages (in Rs.) | No. of Workers |

150 | 3 |

200 | 5 |

250 | 4 |

300 | 2 |

350 | 1 |

(i) The range in wages (in Rs.) = 350 -150 = 200.

(ii) Only 1 worker is getting Rs. 350.

(iii) 3 workers are getting the minimum wages, i.e, Rs. 150.

**Construct a frequency distribution table for the following marks obtained by 25 students in a history test in class VI of a school:**

9, 17, 12, 20, 9, 18, 25, 17, 19, 9, 12, 9, 12, 18, 17, 19, 20, 25, 9, 12, 17, 19, 19, 20, 9 |

**(i) What is the range of marks? (ii) What is the highest mark? (iii) Which mark is occurring more frequently?**

Required frequency-distribution table:

Marks | Frequency |

9 | 6 |

12 | 4 |

17 | 4 |

18 | 2 |

19 | 4 |

20 | 3 |

25 | 2 |

(i) Range of marks: 25-9=16.

(ii) The highest mark is 25.

(iii) 9 is occurring most frequently.

**In a mathematis test following marks were obtained by 40 students of class VI. Arrange these marks in a table using, tally marks.**

**(i) Find how many students obtained marks equal to or more than 7? (ii) How many students obtaned marks below 4?**

The Frequency Distribution Table is :

Marks | Tally Marks | Frequency |

1 | II | 2 |

2 | III | 3 |

3 | III | 3 |

4 | 7 | |

5 | 6 | |

6 | 7 | |

7 | 5 | |

8 | IIII | 4 |

9 | III | 3 |

(i) 12 students obtained marks equal to or more than 7.

(ii) Only 8 students obtained marks below 4.

**Following is the choice of sweets of 30 students of class VI: Ladoo, Barfi, Ladoo, Jalebi, Ladoo, Rasgulla, Jalebi, Ladoo, Barfi, Rasgulla, Ladoo, Jalebi, Jalebi Rasgulla, Ladoo, Rasgulla, Jalebi, Ladoo, Rasgulla, Ladoo, Rasgulla, Jalebi, Ladoo, Rasgulla, Ladoo, Ladoo, Barfi, Rasgulla, Rasgulla, Ladoo. (i) Arrange the names of sweets in a table using tally marks. (ii) Which sweet is preferred by most of the students.**

(ii) Ladoo is preferred by most of the students, 12 students.

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