8) Suppose a department store wants to estimate u, the average age of the customers in its contemporary apparel department, within 2 years with 95% confidence. Approximately how large a sample would be required? The standard deviation is 7.5 years. I

Ineed if you could explain and give me the answer you! this needs done

The sum of the reciprocal of a positive number and the reciprocal of 2 more than the number is 3/4 equation: the number is

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.