The following data give the number of clients holding a motor vehicle insurance policy in each group age:
Age group 16-20 20-30 30-40 40-60 60-90
No. of Clients 45 87 141 163 64
Assume a uniform distribution of ages over each interval.
(a) Estimate the probability that a randomly selected client is over 28 years old.
(b) Estimate the median age of the clients.
(c) Obtain an estimate for the standard deviation.

Question

The following data give the number of clients holding a motor vehicle insurance policy in each group age:
Age group    16-20	20-30	30-40	40-60	60-90 
No. of Clients	 45	   87	           141	163          64 
Assume a uniform distribution of ages over each interval.  
(a)	Estimate the probability that a randomly selected client is over 28 years old.
(b)	Estimate the median age of the clients.
(c)	Obtain an estimate for the standard deviation.