Answer
397.2k+ views
Hint:Here, we have to find the new mean when each of the $8$ numbers are multiplied by $2$. First we will find the total sum of all the numbers by using the given formula and get the required solution,
Mean weight of all the numbers = $\dfrac{ Total\, weight\, of\, the\, numbers}{Number\, of\, terms}$
Complete step-by-step answer:
According to the given information, we know that,
Mean weight of all the numbers $ = 15$
Number of terms$ = 8$
Assume the total weight of all the numbers to be $'x'$
The formula to be used for attaining the final answer is,
Mean weight of all the numbers $ = $ Total weight of the numbersNumber of terms
Further, we need to substitute the numerical values of the quantities used in the formula to obtain the required solution.
Total weight of the numbers $ = $ Mean weight of all the numbers $ \times $number of terms
$ \Rightarrow x$ $ = 15 \times 8 = 120$
As we know, further each number is multiplied by $2$.
Then, there will be change in the total weight of all the numbers by a multiple of $2$.
Hence, the total weight of all the numbers $ = 2x = 2(120) = 240$
So, now the mean weight of the numbers will also change accordingly.
Therefore, new mean$ = \dfrac{{2x}}{8} = \dfrac{{240}}{8} = 30$.
Hence, the new mean weight of $8$ numbers will be $30.$
Note: Mean of a series of numbers or observations ${a_{1,}}{a_2},{a_3},...,{a_n}$ is given by the formula $\dfrac{{{a_1} + {a_2} + {a_3} + ... + {a_n}}}{n} = \dfrac{{\sum\limits_{i = 1}^n {{a_i}} }}{n}$, where $n$ equals to the number of terms or values in the series. To solve problems of this type, we need to have a good understanding over the topic of computing averages without committing any mistakes.
Mean weight of all the numbers = $\dfrac{ Total\, weight\, of\, the\, numbers}{Number\, of\, terms}$
Complete step-by-step answer:
According to the given information, we know that,
Mean weight of all the numbers $ = 15$
Number of terms$ = 8$
Assume the total weight of all the numbers to be $'x'$
The formula to be used for attaining the final answer is,
Mean weight of all the numbers $ = $ Total weight of the numbersNumber of terms
Further, we need to substitute the numerical values of the quantities used in the formula to obtain the required solution.
Total weight of the numbers $ = $ Mean weight of all the numbers $ \times $number of terms
$ \Rightarrow x$ $ = 15 \times 8 = 120$
As we know, further each number is multiplied by $2$.
Then, there will be change in the total weight of all the numbers by a multiple of $2$.
Hence, the total weight of all the numbers $ = 2x = 2(120) = 240$
So, now the mean weight of the numbers will also change accordingly.
Therefore, new mean$ = \dfrac{{2x}}{8} = \dfrac{{240}}{8} = 30$.
Hence, the new mean weight of $8$ numbers will be $30.$
Note: Mean of a series of numbers or observations ${a_{1,}}{a_2},{a_3},...,{a_n}$ is given by the formula $\dfrac{{{a_1} + {a_2} + {a_3} + ... + {a_n}}}{n} = \dfrac{{\sum\limits_{i = 1}^n {{a_i}} }}{n}$, where $n$ equals to the number of terms or values in the series. To solve problems of this type, we need to have a good understanding over the topic of computing averages without committing any mistakes.
Recently Updated Pages
How many sigma and pi bonds are present in HCequiv class 11 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Why Are Noble Gases NonReactive class 11 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let X and Y be the sets of all positive divisors of class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let x and y be 2 real numbers which satisfy the equations class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let x 4log 2sqrt 9k 1 + 7 and y dfrac132log 2sqrt5 class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let x22ax+b20 and x22bx+a20 be two equations Then the class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Trending doubts
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
At which age domestication of animals started A Neolithic class 11 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Which are the Top 10 Largest Countries of the World?
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Give 10 examples for herbs , shrubs , climbers , creepers
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference Between Plant Cell and Animal Cell
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Write a letter to the principal requesting him to grant class 10 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Change the following sentences into negative and interrogative class 10 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Fill in the blanks A 1 lakh ten thousand B 1 million class 9 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)