Question

5. The mean of ten number is 12.5. Later it was discovered that number 9 was misread as 4. Find the correct mean.​

Answer 1

Answer:

Step-by-step explanation:

let the initial sum of ten numbers be x

so x/10=12.5⇒x=125

9 was misread as 4

so we have to delete the number 4 and add  9

so no. of observations remains the same (10)

so final sum of observations=125-4+9=130

so corrected mean=130/10=13

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Answer 2

Answer:

Step-by-step explanation:

let say when misread, the sum of the numbers without 4 is is give nby x and here we have consider 10 numbers ,

then by the definitions of the mean we can get that

THE MEAN is equal to the THE SUM OF THE NUMBERS DIVIDED BY THE TOTAL NUMBER.

the equation will be given as the following

$12.5=\frac{x+4}{10} \\x+4=12.5*10\\x=125-4\\x=121$

we have get the value of the x .

Now going towards the actual mean of the numbers given in that particular  question. let say the actual mean of the question will be z.

then the value of z will be given as $z=\frac{x+9}{10}\\ z=\frac{121+9}{10} \\z=\frac{130}{10} \\z=13$

from the given equation we have got the exact value of the mean i.e. 13.

For more such question;https://brainly.in/question/14197050

https://brainly.in/question/46962087

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