2) Measure lengths using non-standard units. Rani measures the lengths of some objects with her hand-span. Their measurements are as given below. Table = 12 hand spans Window = 8 hand spans Bed = 18 hand spans Notebook = 2 hand spans Based on the given information, answer the following questions: a) Which object has the maximum length? b) Which object measures the least in length? c) Which object is longer: the table or the bed? d) Which object is shorter: the window or the notebook? 3) Measure the length using the given smaller objects. a) b) c) Measurements 47
d) Concept 8.2: Compare Heavy and Light Objects 4) Observe the given picture and answer the following questions. white ball football balloon filled with air a) Which out of the three weighs is the heaviest? b) Which out of the three is the lightest? 48
Chapter Data Handling 9 Let Us Learn About • the terms ‘data’ and ‘collection’. • interpreting data. Concept 9.1: Collect, Represent and Interpret Data Think Bantei has a collection of different toys. He knows the total number. He wants to know how many toys he has of each type. How can Bantei find this out? 49
Recall We have learnt how to count the number of objects. Let us recall the same. Observe the given animals on the farm and answer the questions. a) Count the number of sheep. [ ] b) How many butterflies can you see? [ ] c) How many ducks can you count? [ ] d) Count the number of dog(s). [ ] & Remembering and Understanding Collection: A group of similar type of items or objects taken together is called a collection. Data: A collection of facts, such as numbers, words, measurements and so on is called data. 50
Let us learn to identify a collection and form its data. Example 1: Here are a few collections of objects. Name them. One is done for you. A collection of A collection of A collection of pencils _________________ _________________ A collection of A collection of A collection of _________________ __________________ __________________ Now let us see the following example. Example 2: O bserve the collection of balls and answer the questions. a) H ow many balls are there altogether? b) How many balls are orange in colour? c) H ow many balls are blue in colour? d) H ow many green balls are there? Data Handling 51
e) Which coloured ball is one in number? Solution: a) Total number of balls is 11. b) There are 2 orange balls. c) There are 3 blue balls. d) There are 5 green balls. e) Pink From a collection, we get some data. From this data, we get some information. Application We collect data to get some information from it. Let us see a few examples of data collection. Example 3: Radha went to a vegetable market. She bought the vegetables shown on the right. Make collections of each type of vegetable. Solution: The collections of each type of vegetable are: Vegetable Collection No. of vegetables 10 5 3 52
Example 4: Ravi kept some pencils, erasers Eraser Solution: and sharpeners in a box. Make collections of each type of item. Eraser The collections of each type of item Eraser Eraser are: Item Collection No. of items 4 5 Eraser 4 Eraser Eraser Eraser Eraser Higher Order Thinking Skills (H.O.T.S.) 53 Now, let us see another example. Example 5: Observe the collection of birds in a zoo. M ake collections of each type of bird. Answer the questions that follow. a) How many birds of each type are there? b) Which two birds are equal in number? c) Which bird is the maximum in number? d) W hich bird is the minimum in number? Data Handling
e) W hat is the total number of peacocks and parrots? f) W hich bird is more in number, hen or owl? g) How many ducks are there in the collection? Solution: a) Number of birds of each type are as given below. Bird Collection Number of Birds Parrot 7 Peacock 2 6 Hen Duck 2 Pigeon 1 Crow 4 54
Bird Collection Number of Birds 3 Owl 1 Sparrow b) Peacock and duck; pigeon and sparrow are equal in number. c) Parrot is maximum in number. d) Pigeon and sparrow are minimum in number. e) There are 9 peacocks and parrots in the collection. f) Hen is more in number. g) There are 2 ducks in the collection. Drill Time Concept 9.1: Collect, Represent and Interpret Data 1) What collections do these pictures show? a) b) Data Handling 55
c) d) 2) Observe the picture and answer the following. a) H ow many birds are there altogether? b) H ow many orange birds are there? c) H ow many blue birds are there? d) W hich colour bird is the maximum in number? e) W hich colour bird is the minimum in number? 3) Observe the collection given. M ake collections of each type of fruit and answer the questions that follow. a) How many fruits of each type are there? b) W hich fruit is the maximum in number? c) W hich fruit is the minimum in number? d) W hat is the total number of bananas and strawberries? e) W hat is the total number of apples and pineapples? f) W hat is the difference between the number of strawberries and apples? 56
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