Provide an appropriate response.When comparing electrical usage among utility customers, a small standard deviation indicates that the mean:
A. shows that electrical usage is decreasing
B. is a typical value in the data set
C. shows that electrical usage is increasing
D. is not a typical value in the data set
Answer: B
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Solve the problem.In June, Carla charged the following expenses to her credit card: winter coat 
jeans 
and shoes 
On July 1, she makes a payment of $200 and makes no other purchases with this credit card. The bank that issues the card charges 1.2% interest per month. What is the balance due on August 1?
A. $234.01 B. $451.35 C. $266.38 D. $248.95
Use the horizontal line test to determine whether the function is one-to-one.
A. Yes B. No
Solve the problem.An artifact is discovered at a certain site. If it has 78% of the carbon-14 it originally contained, what is the approximate age of the artifact to the nearest year? Carbon-14 decays at the rate of 0.0125% annually. Round to the nearest year, if necessary.
A. 1760 years B. 1988 years C. 863 years D. 6240 years
Use a number line to find the sum.-1 + 5
A. -4 B. 4 C. -6 D. 5