The following table contains the probability distribution for X = the number of

Question

The following table contains the probability distribution for X = the number of retransmissions necessary to successfully transmit a 1024K data package through a double satellite media. 12. Referring to Table 5-3. the probability of no retransmissions is___________. a) 0.50 b) 0.35 c) 0.10 d) 0.25 Referring to Table 5-3. the probability of at least one retransmission is ___________.a) 0.35 b) 0.25 c) 0.65 d) 0.05 Referring to Table 5-3, the mean or expected value for the number of retransmissions is ____________. a) 0.65 b) 0.25 c) 0.70 d) 1 Referring to Table 5-3, the variance for the number of retransmissions is ___________. a) 0.80 b) 0.20 c) 0.25 d) 0.27 Referring to Table 5-3. the standard deviation of the number of retransmissions is _____________. a) 0.519 b) 0.447 c) 0.894 d) 0.50

Explanation / Answer

Q12.
P(X=0) = 0.35
Q13.
P(X>=1) = 0.35 + 0.25 + 0.05 = 0.65
Q14.

f=   1  
fx =   1  
      
Mean = fx / f =   1  
Mean square = f x^2 / f =   1.8  
      
Varriance = (Mean square) - (Mean)^2      
      
Varriance = f x^2 - Mean^2 =   0.8  
Stadard Dev= Var =   0.894  
      

Values ( X ) Frequency(f) fx ( X^2) f x^2 0 0.35 0 0 0 1 0.35 0.35 1 0.35 2 0.25 0.5 4 1 3 0.05 0.15 9 0.45

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