Use a table of areas to find the specified area under the standard normal curve.
-The area that lies between -0.73 and 2.27
A)0.4884
B)0.7557
C)1.54
D)0.2211

Question

Use a table of areas to find the specified area under the standard normal curve.
-The area that lies between -0.73 and 2.27 
A)0.4884
B)0.7557
C)1.54
D)0.2211

Quizplus · Accepted Answer

The area under the standard normal curve between two z-scores (in this case, -0.73 and 2.27) is found by calculating the area from the mean to each z-score and then adding or subtracting these areas as appropriate. Looking up the areas corresponding to z-scores of -0.73 and 2.27 in a standard normal distribution table, we find the areas to the left of these z-scores. The area to the left of 2.27 is approximately 0.9883 and the area to the left of -0.73 is approximately 0.2327. Subtracting these (0.9883 - 0.2327) gives us the area between these two z-scores, which is 0.7556, rounded to 0.7557.

Use a Table of Areas to Find the Specified Area