Question

Find r, if  − . ( − ) = 120, ( − ) 2 = 500 , ( − ) 2 = 150​

Answer 1

Step-by-step explanation:

Given that: n=10

∑x=50,∑y=−30

∑x2=290,∑y2=300,

∑xy=−115

Formula :

=n∑x2−(∑x)2.n.∑y2−(∑y)2n∑xy−∑x.∑y

r=10×290−(50)2.10×300−(−30)2[10×(−115)]−[50×(−30)]

=2900−2500.3000−900−1150+1500

=400.2100350

=20×1021

Answer 2

Answer:

the answer is

Step-by-step explanation:

Given that: n=10

∑x=50,∑y=−30

∑x2=290,∑y2=300,

∑xy=−115

Formula :

=n∑x2−(∑x)2.n.∑y2−(∑y)2n∑xy−∑x.∑y

r=10×290−(50)2.10×300−(−30)2[10×(−115)]−[50×(−30)]

=2900−2500.3000−900−1150+1500

=400.2100350

=20×1021

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