Solve the problem.A collection of dimes is arranged in a triangular array with 14 coins in the base row, 13 in the next, 12 in the next, and so on with 1 dime in the last row. Find the value of the collection.
A. $10.50
B. $1.05
C. $5.25
D. $21.00
Answer: A
Mathematics
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A. 
?
B. 
?
C. 
?
D. 
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A. 
B. {3}
C. {0}
D. ?
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A. 7.970 B. 7.971 C. 7.9707 D. 7.972
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What is the expected value of X?
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