1. In 15 minutes, an average of 3 birds visits our bird feeder. Let X be the number of birds that visit in an hour. What is the value of for this Poisson distribution?

• 15
• 0.2
• 12
• 45

We've listed 112 paintings for auction. There is an 85% chance that any individual painting will sell. What is the probability that we sell more than 100 paintings? You can use a normal curve to approximate the answer.

• 90%
• 10%
• 79%
• 5%
• 21%
• 3%

Eleven children are hiding in a game of hide-and-seek. The seeker will find a hider 70% of the time. If X is the number of children she will find, what is the value of P(X > 9)?

• 11%
• 20%
• 31%
• 9%

The distribution of a random variable is given by the following table.

Value Probability

0 .1000

1 .1500

2 .2000

3 .2500

4 .1700

5 .1300

Find P(X < 4).

• .1700
• .7000
• .4500
• .8700