Question 844636: Hello Kitty is a small car wash shop on 36th Ave, which has TWO service points. Based on some historical data records of daily number of car served, owner of the shop created the following probability table.
Daily # of Car served Probability
5 0.12
6 0.23
7 0.4
8 0.12
9 0.09
10 0.04
the owner has to decide how big the parking space measured by number of parking spots (one car per spot) he shall purchase in front of his shop. If he wants to make sure that approximately at least 75% of time, there are enough parking spots on daily base, the number of parking spots he shall purchase is
Answer by ewatrrr(24785)   (Show Source):
You can put this solution on YOUR website!
Hi,
5 0.12 0.6 3
6 0.23 1.38 8.28
7 0.4 2.8 19.6
8 0.12 0.96 7.68
9 0.09 0.81 7.29
10 0.04 0.4 4
m = 6.95 49.85
48.30 -48.30
1.55
1.24 SD
75% of time
z = .6745 = (x-6.95)/1.24 , x = 7.79 0r 8 rounded Up to nearest whole number
75% of the time there can be as many as 8 cars daily to be washed
TWO service points: if they all come at once...
Re Reply: three independent projects
Each of the three projects has probability of being profitable equal to 0.5
P(knowing that two of the three projects indeed bring profit, that the third project is profitable) = .5
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