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The algebraic sum of the deviations of a set of n values from their mean is - Mathematics

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प्रश्न

The algebraic sum of the deviations of a set of n values from their mean is

पर्याय

  • 0

  • n – 1

  • n

  • n + 1

MCQ

उत्तर

The algebraic sum of the deviations of a set of n values from their mean is 0

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 8: Statistics - Exercise 8.4 [पृष्ठ २८८]

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सामाचीर कलवी Mathematics [English] Class 9 TN Board
पाठ 8 Statistics
Exercise 8.4 | Q 5 | पृष्ठ २८८

संबंधित प्रश्‍न

The enrolment in a school during six consecutive years was as follows:

1555, 1670, 1750, 2013, 2540, 2820

Find the mean enrolment of the school for this period.


Solve any two of the following. 

In some families in a colony the daily purchase of milk in litre is 1, 3, 2, 2, 4, 1, 2, 2, 1. Find the mean, median and mode of daily purchase of milk. 


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


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) `bb(x_i)`
No. of Families
(frequency) `bb(f_i)`
`bb(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.

In a class test in mathematics, 10 students scored 75 marks, 12 students scored 60 marks, 8 students scored 40 marks and 3 students scored 30 marks. Find the mean of their score


The mean of the square of first 11 natural numbers is


The mean of a set of numbers is `bar(X)`. If each number is multiplied by z, the mean is


If the arithmetic mean of 8, 4, x, 6, 2, 7 is 5, then the value of x is ______.


Mean can never be a fraction.


The mean age of 25 teachers in a school is 40 years. A teacher retires at the age of 60 years and a new teacher is appointed in his place. If the mean age of the teachers in this school now is 39 years, then the age (in years) of the newly appointed teacher is ______.


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