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# Standard Deviation: Bell Shaped Distribution

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Suppose the data have a bell shaped distribution with a mean of 30 and a standard deviation of 5. Use the empirical rule to determine the percentage of data within each of the following ranges: 20 to 40, 15 to 45, and 25 to 35.

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The solution gives detailed steps on determining the percentage of data using empirical rule.

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20 to 40, since (40-30)/5=(30-20)/5=2 which means values lie within 2 standard deviations of the mean, by empirical rule, about 95.45% of the values lie within 2 ...

##### Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.

##### Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.

##### Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.