Use technology or a z-distribution table to find the indicated area. the scores on a standardized exam are normally distributed with a mean of 400 and a standard deviation of 50. approximately 40% of the scores are greater than which score? a) 370 b) 387 c) 413 d) 430

Based on the calculator used, the appropriate choice is
   c) 413

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.