A national trend predicts that women will account for half of all business travellers in
the next 3 years. To attract these women business travellers, hotels are providing
more amenities that women particularly like. A recent survey of American hotels
found that 70% offer hairdryers in the bathrooms. Consider a random and
independent sample of 20 hotels. Find the probability that at least 9 of the hotels in
the sample do not offer hairdryers in the bathrooms.
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