. A medical research project examined the relationship between a subject\'s weig
ID: 2925685 • Letter: #
Question
. A medical research project examined the relationship between a subject's weight and recovery time from a surgical procedure, as shown in the table below. One patient is randomly selected from the 250.
Underweight
Normal weight
Overweight
Total
Less than 3 days
6
15
4
25
3 to 7 days
30
95
20
145
Over 7 days
14
40
26
80
Total
50
150
50
250
a.
What is the probability the selected patient is not underweight? (5 pts.)
b.
What is the probability the selected patient will recover in fewer than 3 days? (5 pts.)
c.
Given that recovery takes over 7 days, what is the probability the selected patient is overweight? (10 pts.)
d.
What is the probability the selected patient is normal weight and will recover in fewer than 3 days? (10 pts.)
e.
What is the probability the selected patient is normal weight or will take over 7 days to recover? (10 pts.)
Underweight
Normal weight
Overweight
Total
Less than 3 days
6
15
4
25
3 to 7 days
30
95
20
145
Over 7 days
14
40
26
80
Total
50
150
50
250
Explanation / Answer
a) Total who are not underweight = 200
So, P = 200/250 = 0.8
b) Total fewer than few days = 25
So, P = (25)/250 = 0.1
c) P = 26/80 = 0.325
d) Here, P = 15/250 = 0.06
e) P = (150+ 80 - 40)/250 = 0.76
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