The mean of a normally distributed data set is 75 with a standard deviation of 5 . Find the data value that is greater than
Click here to see page 1 of the table for areas under the standard normal curve.
Click here to see page 2 of the table for areas under the standard normal curve.
The data value that is greater than
(Round to the nearest whole number as needed.)
Step 1 :Find the z-score that corresponds to the 8% percentile. Since the problem asks for the data value that is greater than 8% of the data, we need to look at the lower tail of the distribution.
Step 2 :Use a standard normal distribution table to find the z-score that corresponds to the 8% percentile. The z-score is approximately -1.41.
Step 3 :Use the z-score formula to find the corresponding data value. The z-score formula is
Step 4 :Rearrange the formula to solve for X:
Step 5 :Substitute the values into the formula:
Step 6 :Calculate the above expression:
Step 7 :Round to the nearest whole number:
Step 8 :