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Economist GMAT
Group X has 6 students, 3 boys who are each j years old, and 3 girls who are each k years old. Group Y has 4 students, 1 boy who is j years old and 3 girls who are each k years old. What is the variance of the ages in group Y?
1) The standard deviation of X is 0
2) j = k
OA D
Group X has 6 students, 3 boys who are each j years old, and 3 girls who are each k years old. Group Y has 4 students, 1 boy who is j years old and 3 girls who are each k years old. What is the variance of the ages in group Y?
1) The standard deviation of X is 0
2) j = k
OA D
