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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. - SSC (English Medium) Class 8 - Mathematics

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Question

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.

Electricity used
(units) `x_i`
No. of Families
(frequency) `f_i`
`f_ix_i`
30 7 _________
45 2 __________
60 8 __________
75 5 __________
90 3 __________
  N = _________ `sum f_ix_i` =______

(1) How many families use 45 units electricity?
(2) State the score, the frequency of which is 5.
(3) Find N, and `sum f_ix_i`
(4) Find the mean of electricity used by each family in the month of May.

Solution

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.

Electricity used
(units) `x_i`
No. of Families
(frequency) `f_i` 
`f_ix_i`
30 7 30 × 7 =  210 
45 2 45 × 2 =  90 
60 8 60 × 8 =  480 
75 5 75 × 5 =  375 
90 3  90 × 3 =  270 
  N =  25  `sum f_ix_i` =  1425 


(1) 2 families use 45 units electricity.

(2) The score with a frequency of 5 is 75.

(3) N = 25, and `sum f_ix_i`= 1425

(4) Since,

          = `1425/25`

          = 57

So, the mean of electricity used by each family in the month of May is 57.

  Is there an error in this question or solution?

APPEARS IN

 Balbharati Solution for Balbharati Class 8 Mathematics (2019 to Current)
Chapter 11: Statistics
Practice Set 11.1 | Q: 2 | Page no. 70
Solution 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. Concept: Concept of Arithmetic Mean.
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