Probability: What is the probability that at least 8 families adopt their puppy from a shelter?

Question

30% of puppies come from rescue shelters. Ten random families were surveyed about where they recently adopted their puppy from.

Answer 1

From Excel, =binom.dist(2,10,.7,1) = .00159

Note how we switched to the probability not adopting and finding prob(successes <= 2) from prob(successes >= 8) so that we could use the cumulative probability (the final 1 in the formula above makes cumulative)