Question

Given var(x) = 25. The equations of the two lines of regression are 5x - y = 22 and 64 x - 45 y = 24. Find (i) mean of x and y, (ii) r, and (iii) standard deviation of y ​

Answer 1

Answer:

asd

Step-by-step explanation:

Answer 2

Answer:

Step-by-step explanation:

GIVEN:

5x - y =22

64 x - 45 y = 24

FIND:

mean of x and y

Solution:

The lines of regression are

First equation:

5x−y=22

Second equation:

64x−45y=24

First equation×45⇒225x−45y=990

Third equation:

225x−45y=990

Third equation - second equation

161x=966

x =966/161

x=6

Change the value of x in the first equation:

5(6) - y = 22

y = 8

Mean of x = 6.

Mean of y = 8

Definition of standard deviation:

The term "standard deviation" (or "") refers to a measurement of the data's dispersion from the mean. A low standard deviation implies that the data are grouped around the mean, whereas a large standard deviation shows that the data are more dispersed.

#SPJ2