# 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 MathematicsData Handling – Chapter 3/Extra Questions for PracticeAnswer 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