1. P336. 7. The capacities ( in ampere-hours) were measured for a sample of 120 batteries. The average was 178 and the standard deviation was 14. (a) Find a 95% con dence interval for the mean capacity of batteries produced by this method. (b) Find a 99% con dence interval for the mean capacity of batteries produced by this method. (c) An engineer claims that the mean capacity is between 176 and 180 ampere-hours. With what level of con dence can this statement be made? (d) Approximately how many batteries must be sampled so that a 95% con dence interval will specify the mean to within 2 ampere-hours? (e) Approximately how many batteries must be sampled so that a 99% con dence interval will specify the mean to within 2 ampere-hours?

Find the area and perimeter of each composite figure. use 3.14 for π. round your answer to the nearest tenth. a square and a right triangle share a common side. image long description a 3-meter by 0.5-meter rectangle has triangles attached like wings to the 3-meter sides. the other two sides of both triangles measure 2.5 meters. the height of each triangle is 2 meters. a 6-inch by 4-inch rectangle has 2 half-circles attached like wings to the 6-inch sides. the radius of each half-circle is 3 inches. find the surface area and volume of each figure. use 3.14 for π. round your answer to the nearest tenth. a right circular cylinder has a base radius of 6 yards and a height of 20 yards. a rectangular prism has a base that is 9 centimeters long and 7 centimeters wide. the height is 2 centimeters. a rectangular prism has a base that measures 11 millimeters by 11 millimeters. the height is 11 millimeters.

Two streets intersect at a 30- degree angle. at the intersection, the are four crosswalks formed that are the same length. what type of quadrilateral is formed by the crosswalks?

This is a map of the mars exploration rover opportunity predicted landing site on mars. the scale is 1cm : 9.4km. what are the approximate measures of the actual length and width of the ellipse? i mostly need to know how to set it up : )