1. 2. A survey of 20 individuals for a city was conducted on how many cell phones are in each household. Blow is a frequency distribution of the data.

X Frequency of X P(X)

0 2

1 4

2 3

3 6

4 5

a. Fill out the P(X) column for probability.

b. Would your answer for part a be valid probability distribution? Why?

c. Find the expected value and standard deviation.

d. Interpret part c.

e. What is the probability that a household would have exactly 3 cell phones?

f. What is the probability that a household would have at least 3 cell phones?