The number of dvds in a random person’s home collection is counted for a sample population of 80 people. the mean of the sample is 52 movies; the entire population is known to have a standard deviation of 12 movies. assuming a 99% confidence level, find the margin of error.

9.4.34  question   to estimate the height of a stone  figure, an observer holds a small square up to her eyes and walks backward from the figure. she stops when the bottom of the figure aligns with the bottom edge of the  square, and when the top of the figure aligns with the top edge of the square. her eye level is 1.811.81 m from the ground. she is 3.703.70 m from the figure. what is the height of the figure to the nearest hundredth of a  meter?