Final answer:
The ratio of right-handed people to the total number of people at the party is approximately 0.85.
Step-by-step explanation:
The ratio of right-handed people to the total number of people at the party can be found by dividing the number of right-handed people by the total number of people at the party.
First, calculate the total number of people at the party by adding the number of right-handed people and the number of left-handed people: 70 + 12 = 82.
Then, divide the number of right-handed people by the total number of people: 70 / 82 = 0.85.
Therefore, the ratio of right-handed people to the total number of people at the party is approximately 0.85.