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# Incoming Phone Calls

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A certain company relies heavily on phone orders. Suppose past records show that R% of all incoming phone calls to this company are orders from customers. At least how big must R be for you to be at least 90% sure that the first phone order of the day will occur on or before the tenth incoming call of the day?

##### Solution Summary

The solution discusses the percentage needed to meet the daily sales quota within 10 phone calls.

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R% of the incoming phone calls are orders from customers. So 1-R% are not orders. So the probability that ...

##### 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.