True or false: the sample size you need to estimate the population distribution should always be at least 10% of the population size.

The tiles below are pieces of a normal ecg tracing representing a little less than two heartbeats at a resting rate of 80 bpm. arrange the tiles in their correct order. rank from first to last. do not overlap any tiles.

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

Aregular pentagon with a perimeter of 21 inches is dilated by a scale factor of 5/3 to create a new pentagon. what is the perimeter of the new pentagon?