Question

the mean of 10 numbers is 20 . if 5 is subtracted from very number . What will be the now mean​

Answer 1

Answer:

Step-by-step explanation:

Hey mate !!

here's ur ans ⤵⤵⤵

mean = sum of obs. / no. of obs.

20 = x / 10,

x =20*10 = 200,

now, 50 is subtracted from 10 num.

total no. subtracted = 5*10 = 50.

new mean = x-50/10,

= 200-50/10,

= 150/10,

=15.

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Answer 2

Answer:

15

Step-by-step explanation:

GENERAL FORMULA FOR MEAN:-

$\frac{sum \: of \: observations}{no \: of \: observations}$

LETS TAKE SUM OF OBSERVATIONS BE X

GIVEN MEAN=20

IT MEANS, 20=

$\frac{x}{10}$

SHIFTING 10 TO R.H.S WE GAIN

20×10=X

200=X,MEANS X=200

NOW,SUBTRACTING 50 FROM NO.

AS TOTAL NO. TO BE SUBTRACTED 5×10=50

SO , AUTOMATICALLY NEW MEAN

=>

$\frac{x - 50}{10}$

$= \frac{200 - 50}{10}$

$= \frac{150}{10}$

$= 15$

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