Employee retention is a major concern for many companies. A survey of Americans asked how long they have worked for their current employer (Bureau of Labor Statistics website, December 2015). Consider the following example of sample data of 2000 college graduates who graduated five years ago.

Step-by-step explanation:

Discrete probability distribution can be written as follows

X. Number P (X)

1. 506 (506/2000) = 0.253

2 390 (390/2000) = 0.195

3 310 (310/2000) = 0.155

4 218 (218/2000) = 0.109

5 576 (576/2000) = 0.288

Solution (b)

For valid discrete probability distribution total probability should be 1

P = 0.253+0.195+0.155+0.109+0.288 = 1

So it is a discrete probability distribution.

Solution (c)

Probability for more than 3 years = p (X=4) + P (X=5) = 0.109+0.288 = 0.397 or 39.7%