An SRS of size 150 is taken from Population A with mean 125 and standard deviation 20. An independent SRS of size 200 is taken from Population B with mean 90 and standard deviation 15. The sampling distribution of the difference in sample means has what mean and standard deviation? mean = 35; SD = 1.95 mean = 35; SD = 5.9 mean = 35; SD = 25 mean = 215; SD = 5.9 mean = 215; SD = 35

This question consists of 2 parts, a and b. marco got a quotient of 70 when he divided 49 by 0.07. part a what is the correct answer to this problem? part b what mistake did marco make? you!

As part of an annual fundraiser to raise money for diabetes research, diane joined a bikeathon. the track she biked on was 1,920 yards long. diane biked 38.5 laps. her sponsors agreed to donate an amount of money for each mile she biked. how many miles did she bike? first fill in the blanks on the left side using the ratios shown. then write your answer. given ratios: 5280ft / 1 mi , 1 mi /5280 ft , 1,920 yards / 1 lap , 1 lap / 1,920 yards , 3 ft / 1 yard , 1 yard / 3 ft. blanks: 38.5 laps / 1 yard x (blank) x (blank) x (blank) = (blank) miles i'm really confused on how to do this, and the explanations aren't exactly . if you could walk me through how to do this, it would be greatly appreciated.

What are the solutions of the system? solve by graphing. y = x^2 + 3x + 2 y = 2x + 2