Answer:
The amount of money separating the lowest 80% of the amount invested from the highest 20% in a sampling distribution of 10 of the family's real estate holdings is $238,281.57.
Step-by-step explanation:
Let the random variable <em>X</em> represent the amount of money that the family has invested in different real estate properties.
The random variable <em>X</em> follows a Normal distribution with parameters <em>μ</em> = $225,000 and <em>σ</em> = $50,000.
It is provided that the family has invested in <em>n</em> = 10 different real estate properties.
Then the mean and standard deviation of amount of money that the family has invested in these 10 different real estate properties is:

Now the lowest 80% of the amount invested can be represented as follows:

The value of <em>z</em> is 0.84.
*Use a <em>z</em>-table.
Compute the value of the mean amount invested as follows:

    
Thus, the amount of money separating the lowest 80% of the amount invested from the highest 20% in a sampling distribution of 10 of the family's real estate holdings is $238,281.57.
 
        
             
        
        
        
3/5 /  3/7
= 3/5 * 7/3
= 7/5   or 1 2/7
        
             
        
        
        
Answer:
X = 4
Step-by-step explanation:
 5x + 3 = 23
Subtract 3 from both sides: 5x = 20
Divide both sides by 5: x = 4
 
        
             
        
        
        
X+x²=30
x²+x-30=0
(x+6)(x-5)=0
x=-6 or x=5
        
             
        
        
        
Answer:
since there are an even number of negatives, just ignore them and multiply normally. 2 x 2=4
4 x 2=8
8 x 2=16
The answer is 16