द्विपद वितरण में, माध्य और विचरण  है। क्या प्रायिकता है कि यादृच्छिक चर D = 2?

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अवधारणा:

प्रायिकता के द्विपद वितरण के लिए

  • माध्य = np
  • विचरण = npq

जहाँ n कुल मामलों की संख्या है, p अनुकूल मामलों की प्रायिकता है और q प्रतिकूल मामलों (1 - p) की प्रायिकता है 

गणना:

दिया गया है कि माध्य = np = और विचरण = npq =

 =

q =

p = 1 - q =

np =

n = 4

∴  प्रायिकता है कि यादृच्छिक चर D = 2

P =

P =

P =

P =

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