The Table Below Shows Hypothetical Per-Minute Cell Phone Charges for "Pay-And-Talk

question 49

Multiple Choice

The table below shows hypothetical per-minute cell phone charges for "pay-and-talk" service over several years.
TABLE 2-2
-Refer to Table 2-2.Assume that 2008 is used as the base year,with the index number = 100.Which of the following series is the correct set of index numbers for the per-minute cell phone charges from 2008 to 2012?

• A)0.55; 0.50; 0.40; 0.35; 0.25
• B)100; 91; 73; 64; 45
• C)55; 50; 40; 35; 25
• D)1.0; 0.91; 0.73; 0.64; 0.45
• E)100%; 91%; 73%; 64%; 45%

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Definitions:

Trans-4-methylcyclohexanol

A chemical compound featuring a cyclohexane ring with a methyl group and an alcohol group in a trans configuration.

80th Percentile

A value below which 80 percent of the data in a data set falls, indicating the upper 20% of values.

Mean

The average of a set of numbers, calculated by summing all numbers in the set and then dividing by the count of numbers.

Standard Normal

A special case of the normal distribution with a mean of zero and a standard deviation of one.