ELEMENTARY STATISTICS USING EXCEL
SIXTH EDITION EXAM PREP 2026
QUESTION BANK AND ANSWER KEY
MASTER STATISTICS SET
◉ Solve the problem.
Find the area under the standard normal curve between z = 0 and z
= 3.
0.4641
0.9987
0.0010
0.4987
Answer: 0.4987
◉ Find the area under the standard normal curve to the left of z =
1.25.
0.7682
0.8944
,0.1056
0.2318
Answer: 0.8944
◉ Solve the problem.
Find the area under the standard normal curve to the right of z = -
1.25.
0.7193
0.6978
0.5843
0.8944
Answer: 0.8944
◉ Solve the problem.
Use the standard normal distribution to find P(0 < z < 2.25).
0.5122
0.7888
0.4878
,0.8817
Answer: 0.4878
◉ Solve the problem.
Find the area of the indicated region under the standard normal
curve.
0.0968
0.0823
0.9032
0.9177
Answer: 0.9032
◉ Solve the problem.
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 109.
Find the z-score corresponding to this value.
-1.10
0.91
, -0.91
1.10
Answer: 0.91
◉ Solve the problem.
The lengths of pregnancies of humans are normally distributed with
a mean of 268 days and a standard deviation of 15 days. A baby is
premature if it is born three weeks early. What percentage of babies
are born prematurely?
6.81%
8.08%
10.31%
9.21%
Answer: 8.08%
◉ Solve the problem.
The distribution of cholesterol levels in teenage boys is
approximately normal with mean= 170 and standard deviation= 30
(Source: U.S. National Center for Health Statistics). Levels above 200
warrant attention. Find the probability that a teenage boy has a
cholesterol level greater than 200.
SIXTH EDITION EXAM PREP 2026
QUESTION BANK AND ANSWER KEY
MASTER STATISTICS SET
◉ Solve the problem.
Find the area under the standard normal curve between z = 0 and z
= 3.
0.4641
0.9987
0.0010
0.4987
Answer: 0.4987
◉ Find the area under the standard normal curve to the left of z =
1.25.
0.7682
0.8944
,0.1056
0.2318
Answer: 0.8944
◉ Solve the problem.
Find the area under the standard normal curve to the right of z = -
1.25.
0.7193
0.6978
0.5843
0.8944
Answer: 0.8944
◉ Solve the problem.
Use the standard normal distribution to find P(0 < z < 2.25).
0.5122
0.7888
0.4878
,0.8817
Answer: 0.4878
◉ Solve the problem.
Find the area of the indicated region under the standard normal
curve.
0.0968
0.0823
0.9032
0.9177
Answer: 0.9032
◉ Solve the problem.
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 109.
Find the z-score corresponding to this value.
-1.10
0.91
, -0.91
1.10
Answer: 0.91
◉ Solve the problem.
The lengths of pregnancies of humans are normally distributed with
a mean of 268 days and a standard deviation of 15 days. A baby is
premature if it is born three weeks early. What percentage of babies
are born prematurely?
6.81%
8.08%
10.31%
9.21%
Answer: 8.08%
◉ Solve the problem.
The distribution of cholesterol levels in teenage boys is
approximately normal with mean= 170 and standard deviation= 30
(Source: U.S. National Center for Health Statistics). Levels above 200
warrant attention. Find the probability that a teenage boy has a
cholesterol level greater than 200.
