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# Answer to Question #7132 in Statistics and Probability for Annie

Question #7132
A supermarket polled 1,000 customers regarding the size of their bill. The results are given in the table below.
Size of Bill Number of Customers
below $20.00 203$20.00&ndash;$39.99 117$40.00&ndash;$59.99 182$60.00&ndash;$79.99 176$80.00&ndash;$99.99 193$100.00 or above 129
Use probability rules (when appropriate) to find the relative frequency with which a customer&#039;s bill is as stated. (Enter your answers as fractions.)

(a) between $20.00 and$79.99

(b) not between $20.00 and$79.99
The total number of customers is N = 1000.

(a) between $20.00 and$79.99

The number of customers with the bill size between $20.00 and$79.99 is n = 117+182+176 = 475. So, relative frequency is F1 = n/N = 475/1000 = 19/40.
&
(b) not between $20.00 and$79.99

The number of customers with the bill size not between $20.00 and$79.99 is m = N-n = 1000-475 = 525. So, relative frequency is F1 = m/N = 525/1000 = 21/40.

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