The following table shows the probability distribution for a discrete random variable.
х
12
15
17
20
22
24
25
30
P(X) 0.07 0.21 0.17 0.25 0.05 0.04 0.13 0.08
The mean of the discrete random variable Xis 19.59. What is the variance
of X? Round your answer to the nearest hundredth.
A. 31.06
оо
B. 34.71
C. 23.18
D. 26.55
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Which of the following transformations will make coincide with ? a. counter-clockwise rotation 90º about a, followed by a translation 5 units to the right b. translation 5 units to the right, followed by a reflection across the y-axis c. translation 5 units to the right, followed by a reflection across the x-axis d. translation 1 unit up and 5 units to the right, followed by a reflection across the x-axis