Answer:
1/2 and 9/14
Step-by-step explanation:
Let the first fraction be 1/2
Let the second fraction be x
1/2 + x= 8/7
x= 8/7-1/3
= 16-7/14
= 9/14
Hence the two numbers are 1/2 and 9/14
Answer:

Step-by-step explanation:
In the given figure, PQRS is a rhombus and SRM is an equilateral triangle.
We are also given that SN⊥RM and that ∠PRS = 55°.
And we want to find the measure of ∠QSN.
Remember that since PQRS is a rhombus, the angles formed by its diagonals are right angles. Let the intersection point of the diagonals be K. Therefore:

Now, RKS is also a triangle. The interior angles of all triangles must be 180. Thus:

Substitute in known values:

Solve for ∠KSR:

Since SRM is an equilateral triangle, this means that:

Note that RNS is also a triangle. Therefore:

Substitute in known values:

So:

∠QSN is the addition of the two angles:

Therefore:

Answer:
- + - = -
7+4= -11
Step-by-step explanation:
Sorry if wrong
Answer:
(1)



(2)



Step-by-step explanation:
Solving (1):

(a): Mean
This is calculated as:

So, we have:


Solving (b): The variance
This is calculated as:

Where:

and
So, we have:


So, we have:



Solving (c): The standard deviation.
This is calculated as:



Solving (2):

(a): Mean
This is calculated as:

So, we have:


Solving (b): The variance
This is calculated as:

Where:

and
So, we have:


So, we have:



Solving (c): The standard deviation.
This is calculated as:


