For the following population of N = 6 scores: 2, 9, 6, 8, 9, 8

(a) Calculate the range and the standard deviation. (Use either definition for the range)
(b) Add 2 points to each score and compute the range and the standard deviation again. Describe how adding a constant to each score influences measures of variability.

Answer the questions in the attachment. a rescue helicopter is at point a and a rescue boat is at point e. the helicopter pilot spots boats in distress at points d and c,with angles as marked in the diagram. figure abce is a rectangle. the altitude of the rescue helicopter, represented by ae, is 5000 feet.

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)

What three-dimensional solid have 6 rectangular faces, 2 equal bases that are not rectangles and 18 edges