The number of arrivals per minute at a bank located in the central business district of a large city was recorded over a period of 200 minutes, with the data recorded in the excel filea. a. Compute the expected number of arrivals per minute. b. Compute the standard deviation.
The number of arrivals per minute at a bank located in the central business district of a large city was recorded over a period of 200 minutes, with the data recorded in the excel filea.
a. Compute the expected number of arrivals per minute.
b. Compute the standard deviation.
In the game of blackjack as played in casinos in Las Vegas, Atlantic City, and Niagara Falls, as well as in many other cities, the dealer has the advantage. Most players do not play very well. As a result, the probability that the average player wins a hand is about 45%. Find the probability that an average player wins.
a.Twice in 5 hands.
b. Ten or more times in 25 hands.
A sign on the gas pumps of a chain of gasoline stations encourages customers to have their oil checked with the claim that one out of four cars needs to have oil added. If this is true, what is the probability of the following
a. One out of the next four cars needs oil
b. Two out of the next eight cars need oil
c. Three out of the next 12 cars need oil
Arrivals 0 1 2 3 4 5 6 7 8
Frequency 14 31 47 41 29 21 10 5 2
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