यदि एक यादृच्छिक चर X का प्रत्याशित मान 2 है और उसका प्रसरण 1 है, तो 3X + 4 का प्रसरण क्या होगा?

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  1. 9
  2. 6
  3. 7
  4. 11

Answer (Detailed Solution Below)

Option 1 : 9
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Detailed Solution

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संकल्पना:

Var[aX+b]=a2Var(X)

V(ax)=a2V(x) , जहां a स्थिरांक है,

V(a)=0अर्थात स्थिरांक का प्रसरण शून्य है; जहां a स्थिरांक है

हिसाब:

दिया गया है:
Var(x)=1, हमें Var(3x+4) ज्ञात करना है

मान लीजिए y=3x+4

V(y)=V(3x+4)

V(y)=32[V(x)]

V(y)=9[1]

V(y)=V(3x+4)=9

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