Bed day offers savings of $10, $25, $50 and $100 off on their already low price on bedroom suites. Select a coupon and save the amount on the coupon. There are a total of 100 coupons with 70, 20, 8 and 2 containing $10, $25, $50, and $100, respectively. I figured out that the average saving is $46.25. Am I right? Determine the standard deviation.
A. $39.45
B. $34.16
C. $16.55
D. $16.46

Question

Bed day offers savings of $10, $25, $50 and $100 off on their already low price on bedroom suites. Select a coupon and save the amount on the coupon. There are a total of 100 coupons with 70, 20, 8 and 2 containing $10, $25, $50, and $100, respectively. I figured out that the average saving is $46.25. Am I right? Determine the standard deviation. 
A. $39.45
B. $34.16
C. $16.55
D. $16.46