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Practice Quiz
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1
The normal distribution is a
A)Discrete distribution.
B)Continuous distribution.
C)Positively skewed distribution.
D)None of the above.
2
Which of the following are characteristics of the normal distribution?
A)It is a symmetric distribution.
B)It is bell-shaped.
C)It is asymptotic.
D)All of the above.
3
Which of the following are correct statements about a normal distribution?
A)It cannot assume negative numbers.
B)It is defined by its mean and standard deviation.
C)All normal distributions have a variance of at least 1.
D)All of the above are correct.
4
Which of the following statements is correct regarding the standard normal distribution?
A)It is also called the z distribution.
B)Any normal distribution can be converted to the standard normal distribution.
C)The mean is 0 and the standard deviation is 1.
D)All of the above are correct.
5
The are under a normal curve between 0 and –1.75 is
A).0401.
B).9599.
C).4599.
D)None of the above.
6
The area under a normal curve less than 1.75 is
A).0401.
B).9599.
C).4599
D)None of the above.
7
The continuity correction factor is used when
A)The sample size is at least 5.
B)Both np and n (1 - p) are at least 30.
C)A continuous distribution is used to approximate a discrete distribution.
D)The standard normal distribution is applied.
8
In a normal distribution the relationship between the mean, median, and the mode is
A)They are all equal.
B)The mean is the largest.
C)The median is the largest.
D)None of the above.
9
The normal approximation to the binomial is used when
A)The sample size is at least 30.
B)Both np and n (1 - p) are at least 5.
C)The mean and the variance are the same.
D)The z value is greater than 0.
10
In the standard normal distribution, what is the probability of finding a z value between –1.25 and –1.00?
A)0.3944
B)0.3413
C)0.7357
D)0.0531
11
The mean speed of those traveling along a suburban road is 72 km per hour. Assume the distribution of speeds follows the normal distribution and the standard deviation is 3.5 km per hour. Find the probability a randomly selected vehicle is traveling at least 75 km per hour?
A).1949
B).6949
C).8600
D)None of the above.
12
According to a recent study in Canada, 30 percent of the labor force belongs to a union. For a random sample of 50 workers, what is the probability at least 12 belong to a union?
A).8907
B).3599
C).8599
D)None of the above.
13
Basketball players have a mean height of 184 cm with a standard deviation of 4 cm. What is the probability that a player has a height greater than 188 cm?
A).1587
B).3413
C).8413
D).4772
14
Basketball players have a mean height of 184 cm with a standard deviation of 4 cm. What is the probability that a player has a height less than 186 cm?
A).6915
B).1915
C).3085
D).8085
15
The mean weight of salmon caught in BC is 3.5 kg with a standard deviation of l kg. According to the Empirical Rule, about what proportion of them lies between 2.5 and 4.5 kg?
A)75%
B)25%
C)68%
D)95%





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