Grouping of data and Histogram | Data Handling | Assessment | English | Grade 8

The number of times a particular observation occurs in a given data is called its ___

• Frequency

• Class Width

• Class Interval

• Lower class Limit

Answer explanation

The number of times a particular observation occurs in a given data is called its frequency.

In the class interval 12 - 15 the lower class limit is

• 12

• 15

• 3

• 27

Answer explanation

In the class interval 12 - 15, the lower class limit is 12.

What is the frequency of 3 in the given numbers? 1, 3, 5 ,6, 3, 5, 3, 6, 6, 3, 7, 3, 8

• 3

• 5

• 2

• 6

Answer explanation

The number of times a particular observation occurs in a given data is called its frequency. In the given observations, 3 occurs 5 times hence the frequency of 3 in the given observations is 5.

Following histogram shows the range of heights of students in a class of 50 students. Study the histogram and answer the following question. The class interval which contain highest number of students is

• 110 - 120

• 140 - 150

• 150 - 160

• 160 - 170

Answer explanation

If we observe the given histogram, we find that the height of rectangle made for class interval 150 - 160 is tallest. It signifies that class interval 150 - 160 contains highest number of students.

Following histogram shows the range of heights of students in a class of 50 students. Study the histogram and answer the following question. The number of students having height equal to or more than 160 cm is

• 28

• 16

• 46

• 3

Answer explanation

The number of students which have height equal to or more than 160 cm can be found by adding the number of students of class intervals 160 - 170, 170 - 180 and 180 - 190. It will be, 8 + 6 + 2 = 16 students

A policeman records the speed of vehicles on a road with a speed limit of 30 km/h and represents them in the form of histogram. How many vehicles are there which travelled with speed greater than or equal to 20 km/h but less than 50 km/h?

• 165

• 240

• 120

• 195

Answer explanation

Number of vehicles which travelled with speed greater than or equal to 20 km/h but less than 50 km/h = number of vehicles in interval (20 km/h - 30 km/h) + number of vehicles in interval (30 km/h - 40 km/h) + number of vehicles in interval (40 km/h - 50 km/h) = 30 + 45 + 120 = 195