Final answer:
About 50% of the surveyed adults feel that the federal income tax they pay is too high, which is calculated by dividing the number of adults concerned (613) by the total number surveyed (1231) and multiplying by 100%.
Step-by-step explanation:
To find the percentage of adults in a poll who believe the amount of federal income tax they paid is too high, we use the ratio of the number of adults who feel this way to the total number of adults surveyed. In this case, 613 out of 1231 adults think their federal income tax is too high. This is computed as follows:
Percentage = (Number of adults who think tax is too high / Total number of adults surveyed) × 100%
Percentage = (613 / 1231) × 100%
Percentage ≈ 49.8%
To the nearest whole percent, 50% of the adults surveyed feel that the amount of federal income tax they pay is too high.