Identify which of these types of sampling is used: simple random, stratified, systematic, or convenience.A sample consists of every 20th student who leaves the library.
A. Systematic
B. Stratified
C. Simple random
D. Convenience
Answer: A
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Use a tree diagram to answer the question.A family has 4 children. Using a tree diagram that shows how many ways the children could have been born, from first born to last born, determine how many ways the family could have had 2 boys and 2 girls.
A. 8 B. 1 C. 5 D. 6
Solve.In a recent International Gymnastics competition, the U.S., China, and Romania were the big winners. If the total number of medals won by each team are three consecutive integers whose sum is 81 and the U.S. won more than China who won more than Romania, how many medals did each team win?
A. U.S.: 83 medals; China: 82 medals; Romania: 81 medals B. U.S.: 26 medals; China: 25 medals; Romania: 24 medals C. U.S.: 29 medals; China: 28 medals; Romania: 27 medals D. U.S.: 28 medals; China: 27 medals; Romania: 26 medals
Solve the problem. Use 3.14 for ?.The striking circle in field hockey is a semicircle with a radius of 15.9 yd. Find the area of the semicircle.
A. 3175.2936 yd2 B. 793.8234 yd2 C. 396.9117 yd2 D. 99.852 yd2
Solve the equation.4-x = 
A. 
B. {-3}
C. 
D. {3}