Over a long period of time in a large multinational corporation, 10% of all sales trainees are rated as outstanding, 75% are rated as excellent /good, 10% are rated as satisfactory, and 5% are considered unsatisfactory. Find the following probabilities for a sample of 10 trainees selected at random:
a. Two are rated as outstanding.
b. Two or more are rated as outstanding.
c. Eight of the ten are rated either outstanding or excellent /good.
d. None of the trainees is rated as unsatisfactory.
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