Area of a square is side length^2
Area = 15^ 2 = 15 x 15 = 225 square inches.
Answer:
0.0821
Step-by-step explanation:
If the arrival rate is 50 customers per hour (60 minutes), then the expected number of customers in 3 minutes is:

Assuming a Poisson distribution with 2.5 customers per 3 minutes, the probability that zero customers arrive for 3 minutes is:

The probability that the bank stays empty for three minutes is 0.0821.
70.6 what i got was 70.6753275399
Easy! 1 hour - 1 hour and 30 minutes = 30 minutes(together)