# Question: patients arrive at the emergency room of queen elizabeth hospital...

###### Question details

Patients arrive at the emergency room of Queen Elizabeth
Hospital at the average rate of 20 per hour on weekend evenings.
What is the probability of 15 arrivals in 30 minutes on a weekend
evening:

Select one:

A. 0.035

B. 0.042

C. 0.049

D. 0.052

Patients arrive at the emergency room of Queen Elizabeth
Hospital at the average rate of 20 per hour on weekend evenings.
What is the probability of 15 arrivals in 45 minutes on a weekend
evening:

Select one:

A. 0.0119

B. 0.0238

C. 0.1024

D. 0.2048

Patients arrive at the emergency room of Queen Elizabeth
Hospital at the average rate of 20 per hour on weekend evenings.
What is the variance for 15 arrivals in 45 minutes on a weekend
evening:

Select one:

A. 0

B. 5

C. 10

D. 15