A brother and a sister are in the same math class. There are 9 boys and 12 girls in the class. One boy and one girl are randomly chosen. What is the probability that both the brother and the sister are chosen?

Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population standard deviation is 3. be sure to show that you know the formula and how to plug into it. also, clearly state the margin of error.

The sixth grade art students are making a mosaic using tiles in the shape of right triangles. each tile has leg measures of 3 centimeters and 5 centimeters. i f there are 200 tiles in the mosaic what is the area of the mosaic.

Answer this 30 points and brainliest!