One drive-through car wash facility offers three different types of washes: basic, deluxe, and supreme. The manager of the car wash facility tallies customer selections over three days. Type of Car Wash Basic Deluxe Supreme Total Day Friday 15 43 19 77 Saturday 27 52 22 101 Sunday 23 45 19 87 Total 65 140 60 265 Given that a customer got their car washed on Friday, what is the probability that the customer selected the deluxe car wash? Round the answer to four decimal places.
Since the customer washed their car on Friday, use Friday’s total of 77 customers as the denominator. Of those, 43 selected the deluxe wash, so the probability is 43 ÷ 77 ≈ 0.5584, or 55.8%. The correct choice is 55.8 percent.
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