1. Which table shows a probability distribution?

X	0	1	2	3
P	0.4	0.3	0.4	0.1

X	0	1	2	3
P	0.3	0.6	0.5	0.2

X	0	1	2	3
P	0.3	0.1	0.2	0.2

X	0	1	2	3
P	0.1	0.5	0.3	0.1

2. The probability distribution histogram shows the number of days a book is checked out of a library.

What isP(3X

\fP 0.20 0.15 0.10 0.05 X 1 2 3 4 5 6 7 8 9 10 11P 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0 X 3 6 9 12 15 18 21 Number of days