# Important Questions for Class 7 Chapter 3-Data Handling

Everyone keeps telling you that basic foundation also play an important role in the class 10th board exams. Your free set of important questions carries step-by-step explanation and solution. Our math subject experts with years of experience have studied the CBSE exam patterns very carefully and come up with these set of questions based on the current CBSE syllabus. The questions are based on each topic and chapter of the CBSE class 7th syllabus.

**Important questions based on NCERT syllabus for Class 7 Chapter 3 - Data Handling:**

*Question 1*: Marks obtained by students out of 20 in the class test are written on the board. What is the range of the marks? 12, 14, (-1), (-6), 15, 0, 8, 2

*Solution*:

Range is defined as difference of highest and lowest observation.

Here, after arranging marks in ascending order : (-6),(-1), 0 , 2, 8 , 12, 14, 15.

Lowest observation:(-6) Highest observation: 15

Range = 15 – (-6) = 21

*Question 2*: Kalakruthi maintains a neat garden, in which she had a few exotic species of plants. She likes her garden neat and organised. She wants to put her plants according to their heights (in mm). She wants to bifurcate them in such a way that one plant acts as the dividing point. There is equal number of plants on either side of this dividing point.

*Solution*:

We use the median here.

After arranging them in ascending order: 4, 5, 111, 123, 132, 142, 173

The median of the observations is 123 mm as it is the middle term.

*Question 3*: A fair die is rolled once. What is the probability of getting a multiple of 2?

*Solution*:

When a die is rolled once, we will get: 1, 2, 3, 4, 5 and 6

Multiples of 2: 2, 4, 6

Probability of getting a multiple of 2 = 3/6 = 1/2

*Question 4*: Some numbers are written on the board of the class room. Arrange them in ascending order and find the mode of the observations. 2, 3, 4, -1, 2,-1, 2,-3, 2

*Solution*:

Numbers in the ascending order: -3, -1, -1, 2, 2, 2, 2, 3, 4

Mode of the observation: 2

*Question 5*: A box contains marbles which are marked with first ten natural numbers. Find the probability of getting multiples of 2.

*Solution*:

First ten natural number = 1, 2, 3, 4, 5, 6 7, 8, 9, 10

Multiple of 2 = 2, 4, 6, 8, 10

Probability of getting multiple of 2 = 5/10 = ½