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Frequency table

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

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Solution Summary

The solution discusses the concept of the frequency table and how it relates to probability.

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