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Detecting Fraud The Brooklyn District Attorney’s office analyzed the leading (leftmost) digits of check amounts in order to identify fraud. The leading digit of 1 is expected to occur 30.1% of the time, according to “Benford’s law,’’ which applies in this case. Among 784 checks issued by a suspect company, there were none with amounts that had a leading digit of 1.
a. If there is a 30.1% chance that the leading digit of the check amount is 1, what is the expected number of checks among 784 that should have a leading digit of 1?
b. Assume that groups of 784 checks are randomly selected. Find the mean and standard deviation for the numbers of checks with amounts having a leading digit of 1.
c. Use the results from part (b) and the
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Chapter 5 Solutions
ELEMENTARY STATISTICS-ACCESS >CUSTOM<
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