The number of days a group of 320 homes is on market is normally distributed with a mean of 50 and a standard deviation of 13. Estimate how many homes would be on the market at most 37 days. Estimate how many homes would be on the market at least of 24 days.

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.