Introduction: Data

Q.

30 opposite words in English from a to z?

Q. The number of times an observation occurs in a data is called ______

1. range
2. interval
3. raw data
4. frequency

Q.

Data and information are same things. Say true or false. ​

1. True

2. False

Q. Question 39
State whether the statements are True or False.
Mean, median and mode may be the same for some data.

Q. A set of numerical facts, collected with a definite object in view, is known as ____.

1. Range
2. Data
3. Frequency
4. Tally

Q.

Arrange the following marks obtained by students in ascending order and represent them on the number line 12, 4, 6, (-1), (-3 ). What is the difference between the student who scored the highest mark and the one who scored the lowest? [3 MARKS]

Q. Arrange the following numbers in ascending order: 6452, 5426, 6542, 5624

1. 6452, 5426, 6542, 5624
2. 5426, 5624, 6452, 6542
3. 6542, 6452, 5624, 5426
4. 6542, 6452, 5426, 5624

Q. Arrange the following rational numbers in descending order:
(i) $\frac{7}{8},\frac{64}{16},\frac{36}{-12},\frac{5}{-4},\frac{140}{28}$
(ii) $\frac{-3}{10},\frac{17}{-30},\frac{7}{-15},\frac{-11}{20}$

Q.

A set of numerical facts, collected with a definite object in view, is known as

1. Frequency
2. Range
3. Tally marks
4. Data

Q. Fill in the blanks
Question 19
In a set of observations, the observation that occurs the most often is called ___

Q.

Draw frequency distribution table for the following data :

$48,45,45,48,49,50,46,45,48,49,50,47,49,47,49,48,50,45,46,47,46,49,50,50,49,48,46,45,47$

$48,47,46,45,47,49,50,50,49,48,47,46,45,47,49,50,49,50,45,47,48$

Q.

Which of the following data sets are organised?

Data set 1. 5 7 12 18 25 28 34 67 78 98

Data set 2. 101 96 76 69 56 49 44 35 23 11

Data set 3. 2 8 54 65 32 11 13 25 4 33

1. Set 1 & 2

2. Set 2 & 3

3. Set 1 & 3

4. None of the data sets are organised

Q.

If you have to select the players for your football team then which of the following given data sets will help you to take the decision?

Data set 1. Name of the players

Data set 2. Height of the players

Data set 3. Stamina of Players

Data set 4. Nationality of the players

1. All the data sets

2. 1, 3 & 4

3. 1 & 2

4. 2 & 3

Q.

You have to select the players for your football team. Which of the following given data sets will help you to take the decision?

Data set 1. Name of the players

Data set 2. Height of the players

Data set 3. Stamina of players

Data set 4. Nationality of the players

1. 1 & 2

2. 2 & 3

3. 1, 3 & 4

4. All the data sets

Q.

Draw frequency distribution table for the following data :

$14,18,14,17,15,15,17,15,14,14,19,17,20,20,15,16,17,18,18,16$,

$20,16,16,16,17,19,14,20,14,18,17,15,14,17,16,17,16,15,20$.

Q. Arrange the following rational numbers in descending order:

(i) $\frac{-2}{5},\frac{7}{-10},\frac{-11}{15},\frac{19}{-30}$
(ii) $-2,\frac{-13}{6},\frac{8}{-3},\frac{1}{3}$
(iii) $\frac{-4}{9},\frac{5}{-12},\frac{-7}{18},\frac{2}{-3}$
(iv) $\frac{17}{-30},\frac{11}{-15},\frac{-7}{10},\frac{3}{5}$

Q.

Draw frequency distribution table for the following data :

$10,11,10,15,11,11,15,15,15,10,10,10,10,12,13,11,14,12,12,14,13,10,15,14,12,13,11,11,12,12,15,14,13,13,14,15$

Q.

How to make a time machine.

Q.

As Jack was walking towards the city, he was thinking about the math lecture he would have that day (if it was 2015). He always spared time for the kids because he believes that young minds are the way to a great future. He would teach the 7th students Data Handling. The other day, one of his students asked a question- “Is organized data more useful or unorganized data?”

Quite a doubt it was huh, he answered- “Of course, organized data are more useful because”

1. it contains a lesser number of observations than an unorganized data

2. it is easy to understand and interpret than unorganized data

3. it is impossible to understand and interpret unorganized data

4. it is very hard to analyze unorganized data as the size of the data increases

Q.

Which of the following is no way of presenting data?

1. Textual

2. Tabular

3. Visual

4. Diagrammatic

Q.

Jack, a genius, built a Time Machine. Unable to find anybody to test it on, he decided to test the time machine himself. He entered the machine and set it to the future year 2355. Lights flashed, the super generator started and the machine started time travel, for the first time ever.

When everything became normal again, he stepped out of the time machine and noticed the following things:

I) There were so many trees, so many that you can’t spot the ground.

II) There was 1 river.

III) There were nearly 200-400 “Dodo” birds in that area.

IV) There were 0 people to be seen anywhere.

All the things that he observed are-

1. illusions

2. data

3. dreams

4. just observations

Q.

What is the frequency denoted by these tallies.

(a)

(b)

(c)

(d)

Q.

Draw frequency distribution table for the following data :

$265,298,275,280,298,275,295,295,275,295,275,298,280,298,298,275,275,298,280,265,265,298,280,280,275$

Q.

A ___________ is a collection of numbers gathered to give some information.

Q.

Question 87(vi)
The students of class VII have to choose one club from Music, Dance, Yoga, Dramatics, Fine arts and Electronics clubs. The data given below shows the choices made by girls and boys of the class study the table and answer the question that follows:

For Which club is the difference between boys and girls the maximum?

Q. The height of 10 girls were measured in cm and the results are as follows : 135, 150, 139, 128, 151, 132, 146, 149, 143, 141. How many girls have heights more than the 140 ?

Q.

Question 88(ii)
The data given below shows the production of motorbikes in a factory for some months of two consecutive years.

Study the table given above and answer the following question:
In which year was the total output the maximum?

Q.

Jack, a genius mathematician, built a Time Machine. Unable to find anybody to test it on, he decided to test the time machine on himself. He entered the machine and set it to the future year 2355. Lights flashed, the super generator started and so did time travel, for the first time ever.

When everything became normal again, he stepped out of the time machine and noticed the following things:

I) There were so many trees, so many that you can’t spot the ground.

II) There was 1 river.

III) There were nearly 200-400 “Dodo” birds in that area.

IV) There were 0 people to be seen anywhere.

All these things that he observed (as a mathematician) are:

1. illusions

2. data

3. dreams

4. just observations

Q. Three Marks Question:
Explain 'Measurement of actual Performance' as a step of controlling process.

Q.

What is average and how to find it?