Use the frequency distribution to construct a probability distribution. Do NOT round probabilities.

Then, compute the mean and standard deviation. Do NOT round mean; round standard deviation to TWO decimal places.

The following data shows the scores on a three question quiz (scores range from 0 to 3) for 500 test takers.

Quiz Score (X)	0	1	2	3
# of Takers	147	138	123	92

(a) Use the frequencies to fill in the values of P(x). DO NOT ROUND VALUES!

X	P(x)
0
1
2
3

(b) Compute the mean of the probability distribution. Give EXACT answer - do NOT round.

Mean:

(c) Compute the standard deviation of the probability distribution. Round answer to TWO decimal places.

Standard Deviation: