Answer:
Mean = 30
standard Deviation = 2.74
Step-by-step explanation:
Formula 
mean = np
Standard Deviation = 
from the question = 40
P = 75% or 0.75
q = 1 - p = 1 - 75% or 1 - 0.75
To find mean
mean =  40 x 0.75 
            = 30
For Standard Deviation (SD)
Standard Deviation =  
 
        = 
       = 
:. Standard  Deviation       = 2.74
 
        
             
        
        
        
Answer:
18225
Use the formula: .
A = final amount
P = initial amount invested
r = annual interest rate
t = time (in years)
Insert all values in appropriate places.
Simplify.
A=16200(1+(0.025)(6))
 
        
             
        
        
        
Answer:
-4
Step-by-step explanation:
your counting backward from 3
 
        
                    
             
        
        
        
Answer:
0.0906
Step-by-step explanation:
Given that the prevalence of a certain type of tree allergy is 0.26 in the general population
X- the no of persons having tree allergy is binomial since each persons is independent of the other and there are two outcomes.
Here n = 100
Required probability = the probability that exactly 26 of them will have this allergy
=
 
        
                    
             
        
        
        
Answer:
$24
Step-by-step explanation:
a= $30-$12 = 6 cup of coffee
= 18÷6 
= 3 (price for a cup of coffee)
= 3×2
= $6
a= $30-$6
a= $24