
Given: 
population mean, μ =135
population standard deviation, σ = 15
sample size, n = 19
Assume a large population, say > 100,
we can reasonably assume a normal distribution, and a relatively small sample.
The use of the generally simpler formula is justified.
Estimate of sample mean

Estimate of sample standard deviation


  to 5 decimal places.
Thus, using the normal probability table,





Therefore 
The probability that the mean weight is between 125 and 130 lbs 
P(125<X<130)=0.0731166-0.0018308
=
0.0712858
 
        
             
        
        
        
Answer:
C
Step-by-step explanation:
the answer is c, hope this helped :)
 
        
                    
             
        
        
        
b. Any two negative numbers when multiplying gives positive answers which are never between negative numbers. -9*-3=27
c. same logic, positive answer so never less than either negative number. 
 
        
             
        
        
        
Answer:
2nd Choice
Step-by-step explanation:
1 week, according to the graph on 1 x axis (weeks) the y axis (tests taken) reaches 10
 
        
             
        
        
        
Answerx:
x=11
Step-by-step explanation:
11x=50+71
11x=121
x=11