Use the following information for questions:
Suppose that amount spent by students on textbooks this semester has approximately a bell-shaped distribution. The mean amount spent was $300 and the standard deviation is $100.
-Which choice best completes the following sentence? About 68% of students spent between ____.
A) $300 and $400
B) $200 and $400
C) $100 and $500
D) $266 and $334

Question

Use the following information for questions:
 Suppose that amount spent by students on textbooks this semester has approximately a bell-shaped distribution. The mean amount spent was $300 and the standard deviation is $100.
-Which choice best completes the following sentence? About 68% of students spent between ____.
A) $300 and $400
B) $200 and $400
C) $100 and $500
D) $266 and $334

Quizplus · Accepted Answer

The 68% range in a bell-shaped (normal) distribution corresponds to one standard deviation from the mean. Since the mean is $300 and the standard deviation is $100, one standard deviation below the mean is $200 and one above is $400.

Use the Following Information for Questions