A medical research project examined the relationship between a subject's weight and recovery timefrom a surgical procedure, as shown in the table below.
|
Underweight
|
Normal weight
|
Overweight
|
|
Less than 3 days
|
6
|
15
|
3
|
|
3 to 7 days
|
30
|
95
|
20
|
|
Over 7 days
|
14
|
40
|
27
|
a. Use relative frequency to develop a joint probability table to show the marginal probabilities.
b. What is the a patient will recover in over 7 days?