Page 188 - Start Up Mathematics_6

3. During organization of data, tally marks are used to find the:

(a) frequency (b) cumulative frequency
(c) class limits (d) variable
4. Mention of scale is important in:

(a) bar charts (b) pictographs (c) multiple bar charts (d) all of these

5. In a pictograph, if the symbol represents 50 students, then the picture is
equivalent to:
(a) 100 students (b) 110 students (c) 120 students (d) 150 students

solve Mentally
True or False
1. The frequency 7 is represented as VII using tally marks.

2. Bar graphs can be drawn only vertically.
3. Width of the bar is of no significance. It is merely for attraction.
4. In a bar graph, bars are drawn with equal spacing between them.

5. In a bar graph showing various modes of transportation used by students to travel to school,
the bar having minimum length represents the most likely mode of transportation.
6. Bars can be drawn either vertically or horizontally.

Fill in the Blanks
1. Two bars of same height represent _____________ frequency.

2. The frequency of 12 is written symbolically as _____________ using tally marks.
3. In a _____________ the data is represented using pictures or symbols.
4. In a pictograph if one wrist watch represents 100 watches, 700 wrist watches can be represented
by _____________ watches.

5. If picture of one electric bulb is used to represent 20 bulbs, then a picture of a half bulb will
represent _____________ bulbs.
Answer in One Word or a Line

1. What information does the bar graph give?
2. What is the significance of height and width of a bar?

3. What do you mean by primary data?
4. Define secondary data. Can a given data be both primary and secondary data?
5. Two friends Sonal and Sameera draw bar graphs to represent the same information. Can the
height of the corresponding bars drawn by the two be different? Give reasons.

let’s evaluate
1. A die was thrown 30 times and the following scores were obtained:

4, 1, 3, 2, 6, 2, 4, 2, 1, 2, 3, 6, 2, 6, 4, 2, 1, 4, 1, 2, 5, 4, 2, 2, 5, 4, 3, 2, 5, 6
Prepare a table using tally marks and answer the following questions:

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