The mean value of the random variable X is: D. 0.9.
It should be noted that from the information given, random variable X takes the values 0, 1, and 2. If P(x = 1) = P(x = 2) and P(x = 0) = 0.4.
Then, the mean value of the random variable X will be:
= (0 × 0.4) + (1 × 0.3) - (2 × 0.3)
= 0.9
Therefore, the mean value of the random variable X is: D. 0.9.
Complete question:
A random variable X takes the values 0, 1, and 2. If P(x = 1) = P(x = 2) and P(x = 0) = 0.4. Then the mean value of the random variable X is:
A. 0.2
B. 0.5
C. 0.7
D. 0.9
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