Question 1165741
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"At least 4" in this problem means either 4 or 5; "two or fewer" means 2 or 1 or 0.  Since those are all "OR"s, add the individual probabilities.<br>
a. P(0)<br>
b. P(4)+P(5)<br>
c. P(2)+P(1)+P(0)<br>
You can do the simple arithmetic....<br>