What is the mean for the data set? 682, 605, 648, 678, 654, 612, 606, 621, 642, 679 express your answer as a decimal to the nearest tenth. a. 633 b. 631.5 c. 642.7 d. 654

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6