QUESTION 1a) The loudness of sound is measured indecibelunits and is defined by,whereIis the given...

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QUESTION 1a) The loudness of sound is measured indecibelunits and is defined by,whereIis the given intensity and ( in unit) is the intensity of sound at thethreshold of hearing.i. Find the decibel rating of a sound with intensity5000 I0.ii. If a sound has a decibel rating of 85, how much more intense is it than thethreshold sound?QUESTION 2A group of 35 secondary school students are allowed to choose their favourite subjects from a list of subjects which is Anthropology (A), Biology (B) and Chemistry (C). Three students did not choose any subject. The following table shows the number of students who chose at least one subject.						Number of students			Subject chosen							17							A										21							C										15							B										9							A				and				C										11							B				and				C										10							A				and				B							Represent the above information in a Venn diagram.	Calculate the number of students who chose all three subjects.	How many students chose Anthropology only?	Determine the number of students who have two favourite subjects.			Document Preview:				QUESTION 1 a)	The loudness of sound is measured in decibel units and is defined by  		,  	where I is the given intensity and  ( in  unit) is the intensity of sound at the              threshold of hearing.      	 	i.	Find the decibel rating of a sound with intensity 5000 I0.  	ii.	If a sound has a decibel rating of 85, how much more intense is it than the 	 		threshold sound?            QUESTION 2		  A group of 35 secondary school students are allowed to choose their favourite subjects from a list of subjects which is Anthropology (A), Biology (B) and Chemistry (C). Three students did not choose any subject. The following table shows the number of students who chose at least one subject. Number of studentsSubject chosen17A21C15 B9A and C11B and C10A and B		 Represent the above information in a Venn diagram. Calculate the number of students who chose all three subjects. How many students chose Anthropology only? Determine the number of students who have two favourite subjects. 			 __________________________________________________-_____________________

Robert · Accepted Answer

Vane diagram
log 17
log 15
21
10
9
11
' ' ' 3
' ' ' 35
35 3 32
Given
A anthropo y
B bio y
c chemistry
A B
A C
C B
A B C
we know A B C A B C
A B C
 
 
 
 
 
 
  
     
    
 
 
 
32 17 21 15 9 11 10 9
a)   number of students who chose all three subjects= 9
students chose Anthropology
17 9 10 9 7
number of students who hav
A B C A B C A B A C C B C B
C B
C B
c A A B A C C B
d
            
         
  
       
    
e two f avourite subjects
=( ) ( ) ( )
10 9 11 9 9 9
3
A B C B A B C B A B C B          
     

 
QUESTION 1 
 
 
10
0
0
0
10
0
10
0
10
0
8.5
0
8.5
0
10log
5000
5000
10log
36.989
85
85 10log
log 8.5
10
10
I
dB
I
i given I I
Putting the vlue of I
I
dB
I
ii dB
I
I
I
I
I
I
I I



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QUESTION 1 a) The loudness of sound is measured in decibel units and is defined by , where I is the given intensity and ( in unit) is the intensity of sound at the threshold of hearing . i. Find the...

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Number of students	Subject chosen
17	A
21	C
15	B
9	A and C
11	B and C
10	A and B