Question

If each number in a given data is reduced by 10%,
then the mean will be reduced by

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Answer 1

Answer:

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Step-by-step explanation:

Angle between a tangent and the radius drawn at the point of contact is a

Answer 2

Answer:

Initial mean (x) and standard deviation (σ1) of 10 observations are 20 and 2 respectively.

Now we are multiplying each observation by p and then reducing it by q

thus, new mean =x1=p.x−q

x1=21x=21×20=10

⇒10=p.20−q

⇒20p−q=10     ...(1)

and

New standard deviation is given by,

σ2=∣p∣.σ1

As it will not be affected by subtraction of q from each observation

⇒σ2=21σ1=21×2=1

⇒∣p∣×2=1

⇒∣p∣=21

⇒p=±21

If p=+2

Step-by-step explanation:

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