Answer: 0.7464474624
Round this value however your teacher instructs.
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Step-by-step explanation:
(0.76)^5 = 0.2535525376 is the probability of getting all five people having insurance. Each selection is independent.
1 - 0.2535525376 = 0.7464474624 is the probability at least one person doesn't have health insurance.
The events "all 5 have insurance" and "at least one doesn't have insurance" are complementary. Their probabilities add to 1. Either one or the other event must happen, but both cannot happen simultaneously.