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ID: 3178075 • Letter: H
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The following contingency table shows the number of customers who bought various brands of digital cameras at Walmart and Best Buy.
Camera Brand
Best Buy
Walmart
Canon
21
32
Nikon
8
37
Sony
16
30
FujiFilm
5
12
Other
49
40
The probability that the camera was FuliFilm, the probability that it was purchased at Wallmart is.....
Camera Brand
Best Buy
Walmart
Canon
21
32
Nikon
8
37
Sony
16
30
FujiFilm
5
12
Other
49
40
Explanation / Answer
Total number of cameras purchased
= 21 + 8 + 16 + 5 + 49 + 32 + 37 + 30 + 12 + 40
= 250
P(Camera was FuliFilm) = (5 + 12) / 250 = 17 / 250 = 0.068
P(Purchased at Wallmart) = (32 + 37 + 30 + 12 + 40) / 250 = 151 / 250 = 0.604
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