Frequency

Q. Identify the rule and find the missing number in place of the question mark.

21	56	70
45	87	84
115	180	?

Q. Represent 12 using tally marks.

1. 
2. 
3. 
4. 

Q.

A cement company earns a profit of Rs 8 per bag of white cement sold and a loss of Rs 5 per bag of grey cement sold.

(a) The company sells 3, 000 bags of white cement and 5, 000 bags of grey cement in a month. What is its profit or loss?

(b) What is the number of white cement bags it must sell to have neither profit nor loss, if the number of grey bags sold is 6, 400 bags.

Q.
Nobita is in class 7th A. This is the report card of Nobita and the marks obtained are out of 100. In which of the following subjects has Nobita performed the least?

1. Hindi
2. Maths
3. Computer science
4. English

Q. What is known as Frequency of an observation in Statistics?

1. 
   The highest of all the observations
2. 
   The lowest of all the observations
3. 
   The number of times an observation occurs in the data
4. 
   The middle of all the observations

Q.

The weights of newborn babies (in kg) in a hospital on a particular day are as follows:
$2.3,2.2,2.1,2.7,2.6,3.0,2.5,2.9,2.8,3.1,2.5,2.8,2.7,2.9,2.4$
(i) Rearrange the weights in descending order.
(ii) Determine the highest weight.
(iii) Determine the lowest weight.
(iv) Determine the range.
(v) How many babies weigh below 2.5 kg?

Q. In a certain colony, there are 50 families. The number of people in every family is given below. Draw up the frequency table.
5, 4, 5, 4, 5, 3, 3, 3, 4, 3, 4, 2, 3, 4, 2, 2, 2, 2, 4, 5, 1, 3, 2, 4, 5, 3, 3, 2, 4, 4, 2, 3, 4, 3, 4, 2, 3, 4, 5, 3, 2, 3, 2, 3, 4, 5, 3, 2, 3, 2

Q. Consider the following table:

Day	Temperature (in Celsius)
Monday	40
Tuesday	43
Wednesday	42
Thursday	45
Friday	35

On what day is the day is the temperature 2 degrees higher than the average for the week?

1. 
   Tuesday
2. 
   Wednesday
3. 
   Friday
4. 
   Thursday

Q.

Question 81

Change the statement, converting expression into statement in ordinary language:

The number of students dropping out of school last year was m. Number of students dropping out of school this year is m - 30.

Q.

An elevator descends into a mine shaft at the of 6 Min/m . If the descent starts from 10m above the ground level, how long will it take to reach- 350m

Q. The age of 10 studentse are 11, 12, 11, 10, 11, 12, 13, 12, 13 and 11. The frequency of students whose age is 11 is

1. 2
2. 3
3. 4
4. 5

Q.

Question 86(vi)
The marks out of 100 obtained by Kunal and Soni in the half-yearly examination are given below:

Who got more marks in S. Science and What was the difference of marks?

Q.

Consider the following table and answer the questions that follow.

The student who performed best in all three terms is _______ .

1. Anand

2. Shraddha

3. Rajan

4. Priya

Q.

Question 84(iv)
Observe the given data

Find the ratio of the minimum sale to the maximum sale.

Q.

A die is thrown 1000 times with the following frequency for the outcomes 1, 2, 3, 4, 5 and 6 as given below :

$$\begin{array}{ccccccc}Outcome& 1& 2& 3& 4& 5& 6\\ frequency& 179& 150& 157& 149& 175& 190\end{array}$$

(i) Find the probability of getting a 4 or a 6
(ii) Find the probability of getting a multiple of 3 [ 2 MARKS]

Q. Find the average of first five odd numbers.

1. 3
2. 5
3. 7
4. 4

Q. Question 69(i)
Given below are heights of 15 boys of a class measured in centimetres:
128, 144, 146, 143, 136, 142, 138, 129, 140, 152, 144, 140, 150, 142, 154.
Find the height of the tallest boy

Q. Organize the following marks in a class assessment, in a tabular form:
4, 6, 7, 5, 3, 5, 4, 5, 2, 6, 2, 5, 1, 9, 6, 5, 8, 4, 6, 7.
What is the range of the data?

Q.

Meena has 5 one rupee coins for every 2 five rupee coins in her pocket. She has ____% less number of five rupee coins than one rupee coins.

1. 150

2. 30.5

3. 60.2

4. 42.8

Q.

Prepare a frequency distribution table for the following scores. (size of the CI is 5)

14	19	24	35	16	11	18
25	29	19	21	23	29	33

Q.

Question 82(ii)
In a public library, the following observations were recorded by the librarian in a particular week.
$\begin{array}{ccccccc}& & & & & & \\ \text{Days}& \text{Mon}& \text{Tue}& \text{Wed}& \text{Thur}& \text{Fri}& \text{Sat}\\ \text{Newspaper readers}& 400& 600& 350& 550& 500& 350\\ \text{Magazine readers}& 150& 100& 200& 300& 250& 200\end{array}$
On which day, the number of readers in the library was maximum?

Q.

Solve the following.

There are 60 questions in a question paper. If Chandra answers 90% of them, how many questions has she answered?

Q.

Question 83(iv)
Observe the following data:
$\begin{array}{ccc}& & \\ & \text{Government School, Chandpur}& \\ \text{Daily attendance}& & \text{Date: 15.04.2009}\\ \text{Class}& \text{Total students}& \text{Number of students}\\ & & \text{present on that day}\\ \text{VI}& \text{90}& \text{81}\\ \text{VII}& \text{82}& \text{76}\\ \text{VIII}& \text{95}& \text{91}\\ \text{IX}& \text{70}& \text{65}\\ \text{X}& \text{63}& \text{62}\end{array}$
Find the ratio of number of students present to the total number of students of class IX.

Q.

Question 85(i)
Below a list of 10 tallest buildings in India,
This list ranks buildings in India that stand at least 150 m (492 ft.) Tall based and standard height measurement. This includes spires and architectural details but does not include antenna marks. The following data is given as per the available information till 2009. Since new buildings are always under construction, go online to check new taller buildings. Use the information given in the table about skyscrapers to answer the following questions:

Find the height fo each storey of the three tallest buildings and write them in the following table:

Q.

Question 84(iii)
Observe the given data.

Find the total sales during the week.

Q.

In a unit test, Sheriff scores . What is the total marks he has scored in the three subjects?

Q. Question 69(ii)
Given below are heights of 15 boys of a class measured in centimetres:
128, 144, 146, 143, 136, 142, 138, 129, 140, 152, 144, 140, 150, 142, 154.
Find the height of the shortest boy

Q.

Question 9

There are 102 teachers in a school of 3300 students. Find the ratio of the number of teachers to the number of students.

Q.

Find the frequency of 40 in the following given set of data.

10, 40, 80, 100, 60, 40, 30, 40, 20, 40.

1. 1

2. 2

3. 3

4. 4

Q.

Question 83(iii)
Observe the following data:
$\begin{array}{ccc}& & \\ & \text{Government School, Chandpur}& \\ \text{Daily attendance}& & \text{Date: 15.04.2009}\\ \text{Class}& \text{Total students}& \text{Number of students}\\ & & \text{present on that day}\\ \text{VI}& \text{90}& \text{81}\\ \text{VII}& \text{82}& \text{76}\\ \text{VIII}& \text{95}& \text{91}\\ \text{IX}& \text{70}& \text{65}\\ \text{X}& \text{63}& \text{62}\end{array}$
In which class, the difference of total students and number of students present is minimum?