# Choose the correct option from the given alternative : If p.m.f. of a d.r.v. X is P (x) = cx3 , for x = 1, 2, 3 and = 0, otherwise (elsewhere) then E (X ) = - Mathematics and Statistics

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Choose the correct option from the given alternative :

If p.m.f. of a d.r.v. X is P (x) = c/ x^3 , for x = 1, 2, 3 and = 0, otherwise (elsewhere) then E (X ) =

#### Options

• 343/ 297

• 294 /251

• 297 /294

• 294 /297

#### Solution

If p.m.f. of a d.r.v. X is P (x) = c/ x^3 , for x = 1, 2, 3 and = 0, otherwise (elsewhere) then E (X ) = 294 /251

Concept: Probability Distribution of Discrete Random Variables
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#### APPEARS IN

Balbharati Mathematics and Statistics 2 (Arts and Science) 12th Standard HSC Maharashtra State Board
Chapter 7 Probability Distributions
Miscellaneous Exercise 1 | Q 7 | Page 242