Answer:
50
Step-by-step explanation:
140- 40=100
100÷2=50
x=50
 
        
             
        
        
        
Answer:
$204.4
Step-by-step explanation:
The four chairs bought in June cost $35 each, all together $140. Then they bought 2 more chairs on sale for 8% off of $35 each or 92% of $35 which is $32.2 each, all together $64.4. Both buy's together would then equal $204.4
 
        
             
        
        
        
Answer:
1
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
a)0.7
b) 10.03
c)  0.0801
Step-by-step explanation:
Rate of return   Probability
9.5                           0.1
9.8                           0.2
10                             0.3
10.2                          0.3
10.6                          0.1
a.
P(Rate of return is at least 10%)=P(R=10)+P(R=10.2)+P(R=10.6)
P(Rate of return is at least 10%)=0.3+0.3+0.1
P(Rate of return is at least 10%)=0.7
b)
Expected rate of return=E(x)=sum(x*p(x))
Rate of return(x)   Probability(p(x))    x*p(x)
9.5                           0.1                       0.95
9.8                           0.2                      1.96
10                             0.3                        3
10.2                          0.3                        3.06
10.6                          0.1                       1.06
Expected rate of return=E(x)=sum(x*p(x))
Expected rate of return=0.95+1.96+3+3.06+1.06=10.03
c)
 variance of the rate of return=V(x)=![sum(x^2p(x))-[sum(x*p(x))]^2](https://tex.z-dn.net/?f=sum%28x%5E2p%28x%29%29-%5Bsum%28x%2Ap%28x%29%29%5D%5E2)
Rate of return(x)   Probability(p(x))    x*p(x)    x²*p(x)
9.5                           0.1                       0.95       9.025
9.8                           0.2                      1.96         19.208
10                             0.3                       3             30
10.2                          0.3                       3.06        31.212
10.6                          0.1                       1.06         11.236
sum[x²*p(x)]=9.025+19.208+30+31.212+11.236=100.681
 variance of the rate of return=V(x)=sum(x²*p(x))-[sum(x*p(x))]²
 variance of the rate of return=V(x)=100.681-(10.03)²
 variance of the rate of return=V(x)=100.681-100.6009
 variance of the rate of return=V(x)=0.0801
 
        
             
        
        
        
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copycat