CSUF Practice Questions Chapter 6 Quiz ISDS 361A
Skordi
Which of the following is a characteristic of the standard normal probability distribution?
Select one:
a. The standard deviation must be 1
b. The mean, median, and the mode are not equal
c. The distribution is not symmetrical
d. The standard deviation must be 0 - -a. The standard deviation must be 1
-A normal probability distribution
Select one:
a. has a standard deviation of 0.
b. can have mean of any numerical value.
c. needs to have a mean of 0.
d. must have a standard deviation of 1 and a mean of 0. - -b. can have mean of any
numerical value.
-The probability that a continuous random variable takes any specific value
Select one:
a. is equal to zero.
b. is at least 0.5.
c. depends on the probability density function.
d. is very close to 1.0. - -a. is equal to zero.
-Which of the following is not a characteristic of the normal probability distribution?
Select one:
a. The distribution is symmetrical
b. The standard deviation must be 1
c. The mean, median, and the mode are equal
d. The mean of the distribution can be negative, zero, or positive - -b. The standard
deviation must be 1
-Larger values of the standard deviation result in a normal curve that is
Select one:
a. skewed to the right.
b. narrower and more peaked
c. skewed to the left.
, d. wider and flatter. - -d. wider and flatter.
-The highest point of a normal curve occurs at
Select one:
a. the mean.
b. approximately three standard deviations to the right of the mean.
c. two standard deviations to the right of the mean.
d. one standard deviation to the right of the mean. - -a. the mean.
-Given that z is a standard normal random variable, what is the value of z if the area to the
left of z is 0.119?
Select one:
a. 0.381
b. -1.18
c. 2.36
d. +1.18 - -b. -1.18
-The weight of football players is normally distributed with a mean of 200 pounds and a
standard deviation of 25 pounds. What is the minimum weight of the middle 95% of the
players?
Select one:
a. 249
b. 151
c. 190
d. 196 - -b. 151
-The travel time for a college student traveling between her home and her college is
uniformly distributed between 40 and 90 minutes. The probability that her trip will take
exactly 50 minutes is
Select one:
a. 0
b. 0.60
c. 0.02
d. 0.03 - -a. 0
-The starting salaries of individuals with an MBA degree are normally distributed with a
mean of $40,000 and a standard deviation of $5,000. What percentage of MBA's will have
starting salaries of $34,000 to $46,000?
Select one:
a. 50%
b. 38.59%
Skordi
Which of the following is a characteristic of the standard normal probability distribution?
Select one:
a. The standard deviation must be 1
b. The mean, median, and the mode are not equal
c. The distribution is not symmetrical
d. The standard deviation must be 0 - -a. The standard deviation must be 1
-A normal probability distribution
Select one:
a. has a standard deviation of 0.
b. can have mean of any numerical value.
c. needs to have a mean of 0.
d. must have a standard deviation of 1 and a mean of 0. - -b. can have mean of any
numerical value.
-The probability that a continuous random variable takes any specific value
Select one:
a. is equal to zero.
b. is at least 0.5.
c. depends on the probability density function.
d. is very close to 1.0. - -a. is equal to zero.
-Which of the following is not a characteristic of the normal probability distribution?
Select one:
a. The distribution is symmetrical
b. The standard deviation must be 1
c. The mean, median, and the mode are equal
d. The mean of the distribution can be negative, zero, or positive - -b. The standard
deviation must be 1
-Larger values of the standard deviation result in a normal curve that is
Select one:
a. skewed to the right.
b. narrower and more peaked
c. skewed to the left.
, d. wider and flatter. - -d. wider and flatter.
-The highest point of a normal curve occurs at
Select one:
a. the mean.
b. approximately three standard deviations to the right of the mean.
c. two standard deviations to the right of the mean.
d. one standard deviation to the right of the mean. - -a. the mean.
-Given that z is a standard normal random variable, what is the value of z if the area to the
left of z is 0.119?
Select one:
a. 0.381
b. -1.18
c. 2.36
d. +1.18 - -b. -1.18
-The weight of football players is normally distributed with a mean of 200 pounds and a
standard deviation of 25 pounds. What is the minimum weight of the middle 95% of the
players?
Select one:
a. 249
b. 151
c. 190
d. 196 - -b. 151
-The travel time for a college student traveling between her home and her college is
uniformly distributed between 40 and 90 minutes. The probability that her trip will take
exactly 50 minutes is
Select one:
a. 0
b. 0.60
c. 0.02
d. 0.03 - -a. 0
-The starting salaries of individuals with an MBA degree are normally distributed with a
mean of $40,000 and a standard deviation of $5,000. What percentage of MBA's will have
starting salaries of $34,000 to $46,000?
Select one:
a. 50%
b. 38.59%
