Use binomial theorem with N=5, p=0.70
(a) all five resolved
(b) at least one not resolved
i.e. not all five
(c) none resolved
(d) at least one resolved
i.e. not none resolved
A little suggest for follow-ups to my responses.
Start with a follow-up to the original post. If your patience runs out, then start a new post with or without the recipient's name under "school subject".
Assuming you have no problem with parts (a) and (c), parts (b) and (d) are simply the complement to the preceding part.
P(X≤4) means P(X=0)+P(X=1)+P(X=2)+P(X=3)+P(X=4).
However, we make use of the fact that the sum of probabilities of all possible events add up to 1, or
P(X=0)+P(X=1)+P(X=2)+P(X=3)+P(X=4)+P(X=5)=1 (all possible events), so by transposition, we obtain:
as was done in (b) and (d).
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