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The expected value, or mean, of a binomial distribution, is calculated by multiplying
the number of trials (n) by the probability of successes (p), or n x p.
For example, the expected value of the number of heads in 100 trials of head and tales is 50, or (100 * 0.5).
In your case, the mean value for the binomial experiment is 45*0.25 = 11.25. ANSWER
Solved and explained.