For a quality control test, a company checks the miles per gallon (mpg) for a simple random sample of 100 minivans drawn from its current inventory. the average mpg of these 100 minivans is 15.6 with a standard deviation of 1.9 mpg. set up an approximate 95% confidence interval for the average mpg of all minivans in the company's inventory.

24 students walk to school

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.

Ibelieve it’s b? hopefully