If X and Y Are Two Variables with σ_x =

question 131

True/False

If X and Y are two variables with σ_x = 3.8,σ_y = 4.2,and COV(X,Y)= −0.25,then V(X + Y)= 31.58.

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Definitions:

Extensor Muscle

A muscle whose contraction extends or straightens a joint, often opposing a flexor muscle that bends the joint.

Arm

The upper limb of the human body, extending from the shoulder to the hand.

Leg

The leg is the part of the lower limb in humans between the knee and the ankle, comprising bones, muscles, blood vessels, and nerves that support locomotion and weight bearing.

Villonodular Synovitis

Villonodular synovitis is an uncommon joint disorder characterized by swelling and overgrowth of the joint lining, often affecting the knee or hip.