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The frequency distribution to the right shows the various levels of demand for a particular laptop computer sold by a store during the last 50 business days. Determine the average number of laptops sold per day.

Number of Laptops Frequency
0 16
1 7
2 11
3 12
4 3
5 1


The average number of laptops sold per day is 
 

Calculation of average given a frequency table is simple, 
The procedure is as follows, 

1. Multiply each value of x (Number of Laptops) with its corresponding frequency value. 

2. add the product of the data point and the frequency. 

3. Add the frequency values

Divide the answer in 2 to the answer in 3.

16*0 + 7*1 + 11*2 + 12*3 + 3*4 + 1* 5  = 82

Frequency sum = 16 + 7 + 11 + 12 + 3 + 1 = 50

Average laptops sold per day  = 82/50  = 1.64

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