Important Questions for CBSE Class 7 Mathematics/Data Handling
Important Questions for CBSE Class 7 Mathematics is about the Model Questions that you can expect for Yearly Examination. Here you can find out practice problems for Class 7 Mathematics. This worksheet is designed for CBSE Class 7 Mathematics students.
Important Questions for CBSE Class 7 Mathematics
Data Handling – Chapter 3/Extra Questions for Practice
Answer the following:
- Find the range of the following data: 96, 38, 47, 32, 48, 23, 27 and 28?
- Find the mode of the following data: 11, 13, 15, 11, 14, 12, 11, 18, 11 and 19?
- Find the AM of 20, 25, 40, 30 and 35?
- Find the median of the data: 18, 12, 15, 25 and 20?
- When a dice is thrown, find the probability of getting an even number?
- Find the mean of first ten prime numbers?
- A bag contains 8 red balls and 4 blue balls. One ball is drawn at random from the bag. Find the probability of getting:
a) red ball
b) blue ball - Find x if the mean of the following numbers is 30.
28, 25, x, 29, 22 - Find the mean of first 5 multiples of 5?
- Find the median of first 7 prime numbers?
SOLUTION:
- Greatest number: 96
Smallest number: 23
Range = 96 – 23 = 73 - Mode is 11 because it occurs more frequently.
- Arithmetic Mean = Sum of all observations/ Number of observations
= (20 + 25 + 40 + 30 + 35)/5
= 150/5 = 30 - Arrange the given data in ascending order:
12, 15, 18, 20, 25
Median = 18 - Numbers on a die are 1, 2, 3, 4, 5, 6
Even numbers are 2, 4, 6
P (getting an even number) = 3/6 = ½ - First 10 prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23 and 29.
Mean = (2+3+5+7+11+13+17+19+23+27)/10
= 129/10 = 12.9 - Total number of balls = 8 + 4 = 12
Number of red balls = 8
P (getting a red ball) = 8/12 = 2/3
Number of blue balls = 4
P (getting a blue ball) = 4/12 = 1/3 - Given mean = 30
(28 + 25 + x + 29 + 22)/5 = 30
104 + x = 150
x = 150 – 104 = 46 - First 5 multiples of 5 are 5, 10, 15, 20, 25
Mean = (5 + 10 + 15 + 20 + 25)/5 = 75/5 = 15 - First 7 prime numbers are 2, 3, 5, 7, 11, 13, 17.
Median = 7