Table below shows results of a random sample of Firestone Ti

Table below shows results of a random sample of Firestone Tire Stores Showing the average number of P205 70R 15 tires installed per store for the month of November.

Avg # of tires (x) # of stores (w)

16 8

14 15

16 18

18 5

23 4

Calculate the weight mean (average) number of P205 70R 15 tires installed per store in November. PLEASE show answer out to 2nd decimal.

Solution

weight mean = (16*8+14*15+16*18+18*5+23*4)/(8+15+18+5+4) = 16.16