Solution :
It is given that :
Number of students in a random sample majoring in communication or psychology at an university = 250
Total number of students majoring in psychology = 100
Number of students majoring in psychology  those who are happy = 80
So number of students majoring in psychology  those who are not happy = 20
Total number of students majoring in communication = 250 - 100 = 150
Number of students majoring in communication  those who are happy = 115
So number of students majoring in psychology  those who are not happy = 35
a). Probability of the students happy with their major choices are 
     
     = 0.78
b). Psychology major 
                                    = 0.4
c). Probability of the students who are happy with the communication as the choice of major =  = 0.46
 = 0.46
d). Students unhappy with their choice of major given that the student is psychology major =  =  0.018
  =  0.018
 
        
             
        
        
        
4.2% of 50 is 2.1
So 2.1 is your answer
        
             
        
        
        
Answer:
-32m+70
Step-by-step explanation:
-5(8m-7)
-5*8: is -40m
-5*-7 is 35
-40m+8m+70 is -32m+70
 
        
                    
             
        
        
        
Answer:
9
Step-by-step explanation:
4+5 is equal to 9.