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Fifty randomly selected car salespersons were asked the number of cars they generally sell in one week. Ten people answered that they generally sell three cars; thirteen generally sell four cars; seven generally sell five cars; nine generally sell six cars; eleven generally sell seven cars. Complete the table.Data Value (# cars) Frequency Relative Frequency Cumulative Relative Frequency3 4 5 6 7

Question

Fifty randomly selected car salespersons were asked the number of cars they generally sell in one week. Ten people answered that they generally sell three cars; thirteen generally sell four cars; seven generally sell five cars; nine generally sell six cars; eleven generally sell seven cars. Complete the table.Data Value (# cars) Frequency Relative Frequency Cumulative Relative Frequency3 4 5 6 7

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Solution

Data Value (# cars) Frequency Relative Frequency Cumulative Relative Frequency
3 10 10/50 = 0.20 0.20
4 13 13/50 = 0.26 0.20 + 0.26 = 0.46
5 7 7/50 = 0.14 0.46 + 0.14 = 0.60
6 9 9/50 = 0.18 0.60 + 0.18 = 0.78
7 11 11/50 = 0.22 0.78 + 0.22 = 1.00

The relative frequency is calculated by dividing the frequency of each data value by the total number of data values (50 in this case). The cumulative relative frequency is the sum of the relative frequencies of all data values less than or equal to the current data value.

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