Let the two regression lines be given as 3x= 10+5y and 4y=5+15x. Then the correlation between x and y is....

 In the following diagram,when the income increase from 120 crores to 180 crores in an economy then what is the value of f MPC?

A. 0.81

B. O.82

C .0.83✓

D. 0.84

Ans:- MPC= ∆C/∆I

∆C= 170-120=50

∆I=180-120=60

50/60=0.83

Ans:C

2. C= 20+3/4Y and Y=80, What is the value of APC?

A. 3

B 0.75

C. 0.1

D.1✓

Solution: C= 20+3/4Y

                       20+(3/4)80

                       20+3×20

                       20+60

                     =    80

APC= C/Y

        =80/80

        =1

Ans:D

2. Let the two regression lines be given as  3x= 10+5y and 4y=5+15x. Then the correlation between x and y is....

A.-0.40

B. 0.40✓

C. 0.89

D. 1.50

Solution: Equation y on x 

                  3x= 10+5y

                  bxy=3/5

& Equation x on y

                  4y= 5+15x

                 byx= 4/15

Correlation ( r)= √bxy×byx

                        r= √3/5×4/15

                        r= √1/5×4/5

                        r= √4/25

                        r=   2/5

                        r= 0.40

Ans: B