The Forever and Enduring brands of D-cell batteries are both labeled as lasting 150 hours. In reality, they both have a mean life of 155 hours, but the Forever batteries have a standard deviation of 5 hours, whereas the Enduring batteries have a standard deviation of 20 hours. Which brand is the better choice? Why?
A. Forever batteries are better because all of them are used 150 hours and more (as they are labeled), but we can't say this about Enduring batteries.
B. Enduring batteries are better because most of them we can use 150 hours and more (as they are labeled), but we can't say this about Forever batteries.
C. Forever brand are better. Most of Forever batteries are used 150 hours and more (as they are labeled), but we can't say this about Enduring batteries.
D. Enduring batteries are better because some of them we can use 175 hours.
E. None of these.
Answer: C
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