यदि एक सतत यादृच्छिक चर x का प्रायिकता घनत्व फलन 

f(x)={3x2,ox10,elsewhere

है, तो a का मान इस प्रकार क्या होगा कि P[x ≤ a] = P[x > a] है?

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SSC CGL Tier-II ( JSO ) 2016 Official Paper ( Held On : 2 Dec 2016 )
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  1. 1 / 2
  2. 1 / 3
  3. (13)12
  4. (12)13

Answer (Detailed Solution Below)

Option 4 : (12)13
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दिया गया है

f(x)={3x2,ox10,elsewhere

गणना 

P(X < a) = 1/a2 = 0af(x)dx=1/2

⇒ 30ax2dx = 1/2

⇒ 3[x3/3]a0 = 1/2

⇒ 3 × (a3/3 - 0) = 1/2

⇒ a3 = 1/2

a का मान इस प्रकार कि P[x ≤ a] = P[x > a], (1/2)1/3 है। 

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