The Amount of Scholarships Received Among Undergraduates at Mountain Tech

The amount of scholarships received among undergraduates at Mountain Tech are approximately Normally distributed. The mean scholarship grant is $12,000. About 95 percent of undergraduates received scholarship amounts between $7,000 and $17,000. The standard deviation of these scholarship amounts is about:

A) $5,000.
B) $10,000.
C) $12,000.
D) $20,000.
E) $2,500.