Provide an appropriate response. Use the Standard Normal Table to find the probability.

Question

IQ test scores are normally distributed with a mean of 99 and a standard deviation of 11. An individual's IQ score is found to be 127. Find the Z-score corresponding to this value. Round the answer to the nearest hundredth.

Answer 1

z-score = (x - mean)/standard deviation, where x is an individual's IQ score.

You are given x = 127, mean =99 and SD = 11. Substitute these values into the equation for the z-score and compute.