Question

Following are the ages (in years) of 300 patients,
getting medical treatment in a hospital:
Age (in years)
Number of patients
10-20
90
20-30
45
30-40
65
40-50
80
50-60
50
60-70
30
One of the patients is selected at random.
Find the probability that his age is:
(1) 10 years or more
(ii) less than 10 years
(i) 30 years or more but less than 40 years
(iv) 50 years or more but less than 70
years.​​

Answer 1

Step-by-step explanation:

Following are the ages (in years) of 300 patients,

getting medical treatment in a hospital:

Age (in years)

Number of patients

10-20

90

20-30

45

30-40

65

40-50

80

50-60

50

60-70

30

One of the patients is selected at random.

Find the probability that his age is:

(1) 10 years or more

(ii) less than 10 years

(i) 30 years or more but less than 40 years

(iv) 50 years or more but less than 70

years.

Answer 2

It is given that Total number of patients = 360 (i) We know that Probability that his age is 30 years or more but less than 40 years = 60/360 = 1/6 (ii) We know that Probability that his age is 50 years or more but less than 70 years = (50 + 30)/360 So we get Probability that his age is 50 years or more but less than 70 years = 80/360 = 2/9 (iii) We know that Probability that his age is 10 years or more but less than 40 years = (90 + 50 + 60)/360 So we get Probability that his age is 10 years or more but less than 40 years = 200/ 360 = 5/9 (iv) We know that Probability that his age is 10 years or more = 1 (v) We know that Probability that his age is less than 10 years = 0Read more on Sarthaks.com - https://www.sarthaks.com/725176/following-are-the-ages-in-years-of-360-patients-getting-medical-treatment-in-a-hospital