1. Given the following data set:

1,2,2,3,3,3,4,4,4,4,5,5,5,5,5,5

How many numbers are in the lower quartile?

2. Calculate for the following given the values below. Express your answer in 2 decimal places (example: 25.00)

Mean	Standard deviation	Sample Size	Confidence Level
75	10	120	90%

What is the margin of error?

3. Calculate for the following given the values below. Express your answer in 2 decimal places (example: 25.00)

Mean	Standard deviation	Sample Size	Confidence Level
90	15	100	90%

What is the margin of error?

4. Consider the given probability distribution. What is the mean or expected value of the probability distribution? Express your answer into 2 decimal places (example: 25.00)

X 0 1 2 3 4 5 p(x) 0.003 0.045 0.34 0.54 0.55 0.262