Question

The sum of N observations is 130 and
their mean is 13, then the value of Nis
14
16
10
9​

Answer 1

Answer:

$n = \frac{130}{13} = 10$

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Answer 2

Answer:

The value of N is 10.

Step-by-step explanation:

Given, number of observation = N

and sum of observation $= 130$

and mean $= 13$

We know,

Mean $= \frac{Sum \: of \: the \: observation}{Total \: number \: of \: observation}$

For example,if sum of observation $= 50$

and total number of observations $= 5$

So,Mean

$= \frac{50}{5} \\ = 10$

So by given expression,

Total number of observations =

$\frac{Sum \: of \: observations}{mean} \\ = \frac{130}{13 } \\ = 10$

Therefore,N = 10.

This is a problem of Algebra.

Some important Algebra formulas.

(a + b)² = a² + 2ab + b²

(a − b)² = a² − 2ab − b²

(a + b)³ = a³ + 3a²b + 3ab² + b³

(a - b)³ = a³ - 3a²b + 3ab² - b³

a³ + b³ = (a + b)³ − 3ab(a + b)

a³ - b³ = (a -b)³ + 3ab(a - b)

a² − b² = (a + b)(a − b)

a² + b² = (a + b)² − 2ab

a² + b² = (a − b)² + 2ab

a³ − b³ = (a − b)(a² + ab + b²)

a³ + b³ = (a + b)(a² − ab + b²)

Know more about Algebra,

1) https://brainly.in/question/13024124

2) https://brainly.in/question/1169549

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