Z = (score-mean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability between the two Z scores.
The mayor of the town of Quahog, Rhode Island, Adam West, conducted a study to determine the mean household income of his constituents. The study surveyed 500 households and determined that the sample mean was $30,000. The population standard deviation is $4,800. If a homeowner is randomly selected in the town of Quahog, determine the probability that the household income is between $24,336 and $31,824. Write your answer as a decimal between zero and one rounded to the ten-thousandths place.
1 answer