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Answers
A
B
C
D
E
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Difficulty—
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
