C784 - Review Tests - 4,5,6,7
The correct answer is c. This histogram reveals a distribution that is positively skewed as the
long tail of the graph is to the right of the peak.
a) Normal
b) Negatively Skewed
c) Positively Skewed
d) Cannot determine
The answer is c. Use the Empirical Rule to determine that 95%95% of the diastolic blood
pressure values will be within two standard deviations of the mean.
Therefore, the upper limit will be:
65.3+2(11.3)=65.3+22.6=87.965.3+2(11.3)=65.3+22.6=87.9
And the lower limit will be:
65.3−2(11.3)=65.3−22.6=42.765.3-2(11.3)=65.3-22.6=42.7
Therefore, 95%95% of the diastolic blood pressures will be between 42.742.7 mm Hg and
87.987.9 mm Hg.
2)Adult diastolic blood pressures are normally distributed. The mean is 65.3 mm Hg and the
standard deviation is 11.3 mm Hg. What values would 95%95% of the data fall between?
a) 47.2 and 89.7
b) 42.2 and 86.9
c) 42.7 and 87.9
d) 41.6 and 86.8
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The answer is b. The Standard Deviation Rule says that 68% of the values will fall within 11
standard deviation of the mean.
3) Assuming that adult diastolic blood pressures are normally distributed, what is the
approximate percentage of adults who have diastolic blood pressures within 11 standard
deviation of the mean, or between 54.0mm Hg and 76.6 mm Hg?
a) 50%
b) 68%
c) 95.4%
d) 99.7%
The answer is d. The range is the difference between the smallest and greatest values
(maximum and minimum) of a data set. The minimum value is 48; the maximum is 84. 84 -48 =
36
4) What is the range of the following data set?
a) 26
b) 28
c) 32
d) 36
The answer is a. To find the mean, the first step is to add all of the values together. Then divide
that sum (784) by the number of values in the data set (12) . 78/412=65.3
5) What is the mean of the following data set?
a) 65.3
The correct answer is c. This histogram reveals a distribution that is positively skewed as the
long tail of the graph is to the right of the peak.
a) Normal
b) Negatively Skewed
c) Positively Skewed
d) Cannot determine
The answer is c. Use the Empirical Rule to determine that 95%95% of the diastolic blood
pressure values will be within two standard deviations of the mean.
Therefore, the upper limit will be:
65.3+2(11.3)=65.3+22.6=87.965.3+2(11.3)=65.3+22.6=87.9
And the lower limit will be:
65.3−2(11.3)=65.3−22.6=42.765.3-2(11.3)=65.3-22.6=42.7
Therefore, 95%95% of the diastolic blood pressures will be between 42.742.7 mm Hg and
87.987.9 mm Hg.
2)Adult diastolic blood pressures are normally distributed. The mean is 65.3 mm Hg and the
standard deviation is 11.3 mm Hg. What values would 95%95% of the data fall between?
a) 47.2 and 89.7
b) 42.2 and 86.9
c) 42.7 and 87.9
d) 41.6 and 86.8
Previous
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The answer is b. The Standard Deviation Rule says that 68% of the values will fall within 11
standard deviation of the mean.
3) Assuming that adult diastolic blood pressures are normally distributed, what is the
approximate percentage of adults who have diastolic blood pressures within 11 standard
deviation of the mean, or between 54.0mm Hg and 76.6 mm Hg?
a) 50%
b) 68%
c) 95.4%
d) 99.7%
The answer is d. The range is the difference between the smallest and greatest values
(maximum and minimum) of a data set. The minimum value is 48; the maximum is 84. 84 -48 =
36
4) What is the range of the following data set?
a) 26
b) 28
c) 32
d) 36
The answer is a. To find the mean, the first step is to add all of the values together. Then divide
that sum (784) by the number of values in the data set (12) . 78/412=65.3
5) What is the mean of the following data set?
a) 65.3
