The arrival at the information counter of your bank branch follows a Poisson process with an average of two customers every five minutes.

The probability that exactly six customers will arrive in a five-minute period is a) between 16% and 18

b) Between 19% and 21%.

c) Between 4% and 6%.

d) between 1% and 3%

The probability that four or fewer clients will arrive in a ten-minute period is

a) between 17% and 20%

b) between 13% and 16

c) between 56% and 59

d) between 60% and 63

If twelve clients arrived in the first five minutes, the expected number of clients arriving in fifteen minutes (three successive five-minute periods) is

a) between 9 and 14

b) between 5 and 8

c) between 15 and 20

d)between 1 and 4

The average elapsed time between two consecutive clients in minutes is

a) between 7 and 8

b) between 9 and 10

c) between 4 and 6

d) between 1 and 3

The probability that two to three clients will arrive in a ten-minute period is

a) between 25% and 28

b) between 21% and 24

c) Between 33% and 36%.

d) between 29% and 32%.

The expected number of customers arriving during three minutes (three successive one-minute periods) is

a) between 4 and 6

b) between 11 and 14

c) 1 to 3

d) between 7 and 10

The standard deviation of the number of customers arriving during three minutes (three successive one-minute periods) is

a) between 5 and 6.5

b) between 7 and 8.5

c) between 3 and 4.5

d)1 to 2.5