1) The corporate research and development centers for three local companies have the following numbers of employees:

Company	Frequency
U.S. Steel	110
Alcoa	750
Bayer Material Science	250

If a research employee is selected at random, find the probability that the employee is employed by U.S. Steel or Alcoa.

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2) A social organization of 32 members sold college sweatshirts as a fundraiser. The results of their sale are shown below. 

Number of sweatshirts sold	Frequency
0	2
1-5	13
6-10	8
11-15	4
16-20	4
20+	1

If we choose one student at random, find the following probabilities that the student sold:

• More than 10 sweatshirts
• At least one sweatshirt
• 1-5 or more than 15 sweatshirts