Scenario: you have just finished investigating a disease outbreak at a summer picnic party. out of 100 total attendees, a total of 50 individuals became ill. of these, 48 individuals developed vomiting and nausea 4 to 6 hours after the picnic. no one developed a fever. two elderly individuals, however, had complications leading to a more severe form of the illness and had to be hospitalized. after the lab tests were conducted, the infectious agent was identified. the lab tests also revealed that 75% of all the individuals attending the party had been infected. calculate the overall attack rate for the picnic. assume everyone who attended was susceptible.