Page 217 - Basic College Mathematics with Early Integers

194 C HAPTE R 3 I FRACTIONS

There are generally considered to be eight basic blood
types.The table shows the number of people with the Distribution of Blood Types in Blood Donors
various blood types in a typical group of 100 blood Blood Type Number of People
donors. Use the table to answer Exercises 85 through 88.
Write each answer in simplest form. O Rh-positive 37
O Rh-negative 7

A Rh-positive 36
A Rh-negative 6
B Rh-positive 9
B Rh-negative 1

AB Rh-positive 3
AB Rh-negative 1
(Source: American Red Cross Biomedical Services)

85. What fraction of blood donors have blood type A 86. What fraction of blood donors have an O blood type?
Rh-positive?

87. What fraction of blood donors have an AB blood 88. What fraction of blood donors have a B blood type?
type?

Find the prime factorization of each number.

89. 34,020 90. 131,625

91. In your own words, define a prime number. 92. The number 2 is a prime number.All other even
natural numbers are composite numbers. Explain why.

93. Two students have different prime factorizations for 94. Two students work to prime factor 120. One student
the same number. Is this possible? Explain. starts by writing 120 as 12 * 10. The other student
writes 120 as 24 * 5. Finish each prime factorization.
Are they the same? Why or why not?

The following graph is called a circle graph or pie chart. Each sector (shaped like a piece of pie) shows the fraction of
entering college freshmen who expect to major in each discipline shown.The whole circle represents the entire class of
college freshmen. Use this graph to answer Exercises 95 through 98.

13 Arts and 3 95. What fraction of entering college freshmen plan
Other Fields
100 Humanities 25 to major in education?
3
Technical Biological 2
100
Sciences 25
1
Social Sciences 96. What fraction of entering college freshmen plan
10
to major in biological sciences?
4
Business
25
3
Professional
20 97. Why is the Social Sciences sector the same size as
the Engineering sector?
Physical 3 Education 1
Sciences 100 Engineering 1 10 Copyright 2012 Pearson Education, Inc.
10
98. Why is the Physical Sciences sector smaller than
Source: The Higher Education Research Institute the Business sector?