vdoc

12 Test Questions
62. What number in the following data set represents the median?
A. 49
B. 64
C. 56
D. 63
X 1 = 49, X 2 = 56, X 3 = 54, X 4 = 64, X 5 = 56, X 6 = 63
63. The mean of a distribution is 75.8 and the median is 69.2. The distribution can be
characterized as:
A. Symmetric
B. Normal
C. Right skewed
D. Left skewed
64. Suppose the delay in starting the production process whenever there is an
unexpected mechanical failure is uniformly distributed over an interval [0, 30].
Find the mean delay time in all such processes.
A. 30
B. 0
C. 20
D. 15
65. Suppose a quality characteristic of a product is normally distributed with mean
µ = 16 and standard deviation σ = 1.2. The specification limits furnished by the
customer are (13.6, 22.4). Determine what percentage of the product meets the
specifications set by the customer.
A. 68%
B. 75%
C. 95.45%
D. 99.73%
66. Suppose a random variable X assumes each value with the same probability. Then
the distribution of the random X variable is considered to be:
A. Bell shaped
B. Left skewed
C. Uniform
D. Right skewed
67. The range is a best-suited measure of dispersion when the sample size is:
A. Less than 10
B. Exactly 30
C. Greater than 10
D. Between 10 and 30