Answer:
In this case Jack is only using a part or sample of the total population, so he is doing a sample standard deviation. When you use the total population you are doing a population standard deviation, otherwise, it’s always going to be the sample standard deviation.
Both deviations have different notations. The notation for this type of standard deviation (the one used by Jack) is:
"n" for the number of observations (lowercase)
"x-bar" for the average of the sample
"s" for the standard deviation
"s^2" for the variance
Answer:
50 computers
Step-by-step explanation:
After reduction, he bought x computers hence price per unit was 1800000/x
Before reduction, price per unit was 1800000/(x-5)
The difference in the price is 4000 hence
Therefore, x=50
Answer:
15 and 270
Step-by-step explanation:
Using the rule of radicals
× = a
![\sqrt[3]{a}](https://tex.z-dn.net/?f=%5Csqrt%5B3%5D%7Ba%7D)
× × = a
(a)
Given
(
)² × (
)²
= 5 × 3
= 15
(b)
Given
(![\sqrt[3]{9}](https://tex.z-dn.net/?f=%5Csqrt%5B3%5D%7B9%7D)
)³ × (
)²
= 9 × 30
= 270
Answer:Corrupted economies are not able to function properly because corruption prevents the natural laws of the economy from functioning freely. As a result, corruption in a nation's political and economic operations causes its entire society to suffer.
Step-by-step explanation:
Answer:
y = 15
Step-by-step explanation:
In a parallelogram, opposite lengths are equal.
So it means that the length (5y - 20) is equal to (2y + 25).
Now that there is only one variable in the equation, we can solve for the variable.
5y - 20 = 2y + 25
5y - 2y = 25 + 20
3y = 35
y = 15
