Evaluate the given integral by changing to polar coordinates. sin(x2 + y2) da r , where r is the region in the first quadrant between the circles with center the origin and radii 2 and 4

The weight of a small starbucks coffee is a normally distributed random variable with a mean of 340 grams and a standard deviation of 11 grams. find the weight that corresponds to each event. (use excel or appendix c to calculate the z-value. round your final answers to 2 decimal places.)highest 30 percent middle 70 percent highest 90 percent lowest 20 percent