Explanation:
This question tests the knowledge of the mean of the binomial distribution (n, θ)
The expected number of cured patients = E(X) = nθ = 40 * 0.8 = 32
Note that V(X) = nθ(1 - θ)
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The probability that a patient suffering from typhoid will be treated successfully is 0.8. Forty patients are subjected to treatment. Determine the expected value of the number of patients who are treated successfully.
A
7
B
28
C
8
D
32