Q4 of 11 Page 69

The number of Science and Mathematics projects submitted by Model high school, Nandpur in last 20 years at the state level science exhibition is :

2, 3, 4, 1, 2, 3, 1, 5, 4, 2, 3, 1, 3, 5, 4, 3, 2, 2, 3, 2. Prepare a frequency table and find the mean of the data.

1. Write the scores in the 1st column, in ascending order as x1< x2< x3...


2. Write the tally marks in the next column.


3. Count the tally marks of scores and write the frequency of the score, denoted as fi


4. Write the sum of all frequencies below the frequency column.


5. The total frequencies are denoted by ‘N’.


6. In the last column write the products Find fi xi



Formula


Where, xi = score ; fi = frequency ; N = total frequency


Mean



= 2.75


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2

The following table shows the electricity (in units) used by 25 families of Eklara village in a month of May. Complete the table and answer the following questions.


(1) How many families use 45 units electricity?


(2) State the score, the frequency of which is 5.


(3) Find N and Σ fixi


(4) Find the mean of electricity used by each family in the month of May.

 3

The number of members in the 40 families in Bhilar are as follows:

1, 6, 5, 4, 3, 2, 7, 2, 3, 4, 5, 6, 4, 6, 2, 3, 2, 1, 4, 5, 6, 7, 3, 4, 5, 2, 4, 3, 2, 3, 5, 5, 4, 6, 2, 3, 5, 6, 4, 2. Prepare a frequency table and find the mean of members of 40 families.

 1

Observe the following graph and answer the questions.


(1) State the type of the graph.


(2) How much is the savings of Vaishali in the month of April?


(3) How much is the total of savings of Saroj in the months March and April?


(4) How much more is the total savings of Savita than the total savings of Megha?


(5) Whose savings in the month of April is the least?

 2

The number of boys and girls, in std 5 to std 8 in a Z.P. school is given in the table. Draw a subdivided bar graph to show the data.

(Scale : On Y axis, 1cm= 10 students)