The ________ is the most commonly used measure of central tendency.
A) mean
B) median
C) mode
D) standard deviation
Q. 2John's commute time to work during the week follows the normal probability distribution with a mean time of 26.7 minutes and a standard deviation of 5.1 minutes.
What is the probability that the commute time for a randomly selected day will be less than 18 minutes?A) 0.0436
B) 0.0778
C) 0.1271
D) 0.2236
Q. 3The following contingency table shows the number of two-bedroom apartments grouped by monthly rent and location.
Monthly Rent York Lancaster Dover
600 to under 700 6 14 7
700 to under 800 23 17 20
800 to under 900 10 16 12
The probability that a randomly selected apartment from this group was located in York or Lancaster is ________.
A) 0.350
B) 0.435
C) 0.688
D) 0.712
Q. 4The time for a professor to grade an exam is normally distributed with a mean of 16.3 minutes and a standard deviation of 4.2 minutes. The interval around the mean that contains 68 of the times needed to grade exams is ________.
A) 12.1, 20.5
B) 7.9, 24.7
C) 5.8, 26.8
D) 3.7, 28.9
Q. 5Which one of the following statements is true for a left-skewed distribution?
A) The mean is greater than the median.
B) The mean is less than the median.
C) The mean is greater than the mode.
D) The mean is roughly equal to the median.
Q. 6According to LIMRA, 77 of husband-wife families with kids under 18 years old have life insurance. A random sample of six husband-wife families was selected. What is the standard deviation of this distribution?
A) 1.031
B) 1.758
C) 2.029
D) 2.607
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