Solve the problem.Use a tree to show the parent-child relationships in the following family. Ira has three children: Aaron, Jonathan, and Ellen. Aaron has one child: Thomas. Jonathan has one child: Birgit. Ellen has two children: Alex and Alan.
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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Identify which of these types of sampling is used: simple random, stratified, systematic, or convenience.A researcher interviews 19 work colleagues who work in his building.
A. Stratified B. Systematic C. Simple random D. Convenience
Mathematics
Express the angle in radian measure in terms of ?.-90°
A. - 
B. - 
C. - 
D. - 
Mathematics
Solve the problem.Find the variance of the scores: 15, 15, 15, 18, 21, 21, 21. Round to tenths.
A. 9.0 B. 2.8 C. 3 D. 7.7
Mathematics
Convert. When necessary, round the answer to two decimal places.600 minutes = hours
A. 240 B. 25 C. 10 D. 5
Mathematics