please send me maths chapter 3 notes pik
Answers
Step-by-step explanation:
NCERT Solutions for Class 7 Maths Chapter 3 Data Handling Exercise 3.1
Ex 3.1 Class 7 Maths Question 1.
Find the range of heights of any ten students of your class.
Solution:
Let us have the heights of 10 students are as follows:
140 cm, 141.5 cm, 138 cm, 150 cm, 161 cm,
138 cm, 140.5 cm, 135.5 cm, 160 cm, 158 cm
Here, minimum height = 135.5 cm
Maximum height =161 cm
∴ Range = Maximum height – Minimum height
= 161 cm — 135.5 cm = 25.5 cm
Hence, the required range = 25.5 cm.
Ex 3.1 Class 7 Maths Question 2.
Organise the following marks in a class assessment in a tabular form.
4, 6, 7, 5, 3, 5, 4, 5, 2, 6, 2, 5, 1, 9, 6, 5, 8, 4, 6, 7
(i) Which number is the highest?
(ii) Which number is the lowest?
(iii) What is the range of the data?
(iv) Find the arithmetic mean.
Solution:
Let us form a frequency distribution table:
NCERT Solutions for Class 7 Maths Chapter 3 Data Handling 1
NCERT Solutions for Class 7 Maths Chapter 3 Data Handling 2
(i) 9 is the highest marks.
(ii) 1 is the lowest marks.
(iii) Range = Max. marks – Min. marks
= 9 – 1 = 8
(iv) Arithmetic mean = ΣfixiΣfi=10020=5
Ex 3.1 Class 7 Maths Question 3.
Find the mean of first five whole numbers.
Solution:
First 5 whole numbers are 0, 1, 2, 3, 4
∴ Mean =0+1+2+3+45=105=2
Hence, the required mean = 2.
Ex 3.1 Class 7 Maths Question 4.
A cricketer scores the following runs in eight innings:
58, 76, 40, 35, 46, 45, 0, 100
Find the mean score.
Solution:
Following are the scores of the runs in eight innings:
58, 76, 40, 35, 46, 45, 0, 100
∴ Mean = = Sum of all runs Number of innings
=58+76+40+35+46+45+0+1008=4008=50
Hence, the required mean = 50.