question_answer

The given table shows the ages (in years) of 360 patients, getting medical treatment in a hospital.

Age n years)	10-20	20-30	30-40	40-50	50-60	60-70
No. of patients	90	50	60	80	50	30

One of the patients is selected at random. The probability that his age is

(a) 30 years or more but less than 40 years is ____.

(b) 10 years or more is ___.

A)

(a)	(b)
\[\frac{1}{6}\]	\[\frac{2}{9}\]

           

B)

(a)	(b)
\[\frac{1}{6}\]	0

           

C)

(a)	(b)
\[\frac{2}{9}\]	1

           

D)

(a)	(b)
\[\frac{1}{6}\]	1

Correct Answer: D

Solution :

(a) Total number of patients = 360 Number of patients having age from 30 years to 40 years = 60 Required probability (b) Number of patients having age 10 years of more = 360 Required probability