Assignment:
A secretary periodically checks to see how mnay of the three lines into the office are busy. Her findings for one week were the following:
No. Lines busy Frequency
0 20
1 65
2 25
3 10
Let the random variable X be the number of lines busy. Find the probability distribution of X.
A. X P(X)
0 0.20
1 0.65
2 0.25
3 0.10
b. X P(X)
0 0.17
1 0.54
2 0.21
3 0.08
c. X P(X)
0 0.24
1 0.31
2 0.16
d. X P(X)
0 0.23
1 0.48
2 0.18
3 0.11