NCERT Solutions for Class 7 Maths - Data Handling- 3

Ques 1: Fill in the blanks: 
(i) Mean of first 5 natural numbers is ___________
(ii) Range fo the data 12, 15, 7, 9, 16, 18 is ___________
(iii) Median of the data 38, 40, 42, 48, 65, 72, 75, is ___________
(iv) Mode of the data 2, 3, 5, 6, 7, 3, 2, 9 is ___________
Ans: (i) 3
(ii) 11
(iii) 48
(iv) 3

Mean, Median, Mode and Range

Ques 2: A die thrown once find the probability of the following:
(i) Getting a number greater than 5.
(ii) Getting a prime number.
(iii) Getting an even natural number.
(iv) Getting a number less than 4.
Ans: (i) 1/6
(ii) 1/2
(iii) 1/2
(iv) 1/2

Ques 3: If mean of 9, 5, 7, x, 6 is 6, find the value of x.
Ans: 3

Ques 4: What is the range of the these integers? 20, 6, 18, –15, –12, 0
Ans: 35

Ques 5: State whether the given statements are true or false
(i) Mean of the data is always from the given data.
(ii) The range of the data 2, 9, 6,5, 8 would change if 3 was added to each value in the data.
(iii) When a coin to tossed, there are two possible outcomes.
(iv) Probability of selecting you as a monitor within classs is greater than one.
Ans: (i) False
(ii) False
(iii) True
(iv) False

Ques 6: Study the bar graph given below and answer the questions that follow:

(ii) Calcualte the average marks of the studnet.
(iii) If 75 and above marks denote a distiniction, then name the subjects in which the student got distinction.
(iv) Calcualte the percentage of marks the student got oug of 500.
Ans: (i) Mathematics
(ii) 73.6
(iii) Hindi, Mathematics
(iv) 73.6%

Ques 7: Observe the following data and answer the questions that follow:

(i) Draw a bar graph to represtn the above given in formation.
(ii) On which day of the week maximum number of plants planted by students.
(iii) Find the ratio of the minimum and maximum number of plants planted.
(iv) Find the total no. of plants planted.
Ans: (i)

(ii) Tuesday
(iii) 5:9
(iv) 213

Ques 8: Study the double bar graphs given below and answer the following questions:

(i) Which sport is liked the most by class VII students?
(ii) How many student are there in class VII if each student play only one sport?
(iii) How many students of class VI like hocky and football in all?
(iv) For which spart the number of students of class VII is more than that of class VI.
Ans: (i) Circket
(ii) 48
(iii) 24
(iv) Tennis