Which of the following statements is true?
a. A probability distribution of a discrete random variable x cannot be presented graphically.
b. A probability distribution of a discrete random variable x can be presented graphically as a probability histogram.
c. P(x) = x / 12 for x = 1, 2, 3, and 4 is a probability function of a discrete random variable x.
d. None of the above
Q. 2When a distribution has more values to the left and tails to the right, we say it is skewed to the left.
Indicate whether the statement is true or false
Q. 3A tree diagram is constructed for the experiment of tossing a coin three times. If x represents the number of tails in the three tosses, how many branches are assigned the value x = 3?
a. 0
b. 1
c. 2
d. 3
Q. 4The total area of the six bars in a relative frequency histogram for which the width of each bar is five units is 5.
Indicate whether the statement is true or false
Q. 5A ball is drawn from a box containing three balls, one red, one blue, and one green. The ball is returned and a second ball is drawn. A tree diagram is drawn to give the outcomes of the experiment with respect to the colors of the two balls. If x represent the number of red balls in the two selected, how many branches are assigned the value of x = 1?
a. 1
b. 2
c. 3
d. 4
Q. 6A stem-and-leaf plot describes two-digit integers between 30 and 80 . For one of the classes displayed, the row appears as 5234 . The numerical values being described are 25, 35, and 45.
Indicate whether the statement is true or false
Q. 7Given that the numbers 1 through 6 are equally likely to occur, what is P(x 2)?
a. Cannot be determined since we do not know the probability for each number.
b. 1/2
c. 1/3
d. 1/6
Q. 8The class interval in a frequency distribution is the number of data values falling within each class.
Indicate whether the statement is true or false
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