Answer:

Step-by-step explanation:
-Given the population mean is
and the standard deviation is
, we calculate the z-scores using the formula:

#The z-score for 1910 can be calculated as:

#The z-score for 1230can be calculated as:

#The z-score for 2190 is calculated as follows:

#The z-score for 1380 is calculated as:

Answer:

Step-by-step explanation:
We need to find an algebraic expression for the given statement i.e. "the quotient of negative eight and the sum of a number and three".
Let the number be x. Quotient means to divide. It means we need to divide -8 and the sum of x and 3.
So, we can write it as follows :

Hence, this is the required solution.
Answer: 3.75 + - 7
Step-by-step explanation:
1.5x - 3 + 1.5x - 3 + 0.75x - 1
1.5x + 1.5x + 0.75x - 3 + - 3 + - 1
3.75x + - 7
Step-by-step explanation:
[1/2]^-2= 4
[1/3]^-2=9
[1/4]^-2=16
So sum is 4+9+16=29
Hope this helps you.