Page 297 - Start Up Mathematics_7

4. Krish scored full 100 marks in final mathematics examination. The range of the class is 40.

The lowest marks in the class are ___________.
5. Tally marks are used to evaluate ___________.

6. The arithmetic mean of the first 99 natural numbers is ___________.

Questions numbered 7 to 12 are based on the following bar graph. The bar graph shows the
number of hours spent by a programmer on computers per week. Read the graph carefully and
answer the following questions:

Hours spent on computers
28
26
24
22
20
Number of hours 16
18
14
12
10
8
6
4
2
0
Week 1 Week 2 Week 3 Week 4 Week 5

7. The number of hours spent in the third week is ___________.

8. The average number of hours spent on computers per week is ___________.
9. The ratio of the number of hours spent in the first week to that of the number of hours spent

in the second week is ___________.
10. If the weekly data is based on all 7 days, the average time spent per day in the fourth week
is ___________.

11. The median of the weekly time spent on computers is ___________.

12. The range of the weekly hours spent on computers is ___________.

Answer in One Word or a Line

1. Define the term frequency.
2. If Piyush has scored 450 runs in 10 innings, what is his mean?

3. The ages of three brothers are 7, 10 and 12. Find their median age.

4. What is mode?
5. How do we find mode from a bar chart?
6. Can mean, median and mode be equal?

7. Which of the central tendencies is always one of the items in the data?

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