Answer:
The standard deviation will be: 2.1
Step-by-step explanation:
We know that standard deviation is basically the square root of variance.
Using the formula to calculate the standard deviation

As
so the standard deviation can be calculated as:
standard deviation 


Therefore, the standard deviation will be: 2.1
Answer:
∴
and
this two sides include 
Step-by-step explanation:
Given;
A triangle 
We can see the figure of the triangle 
Where the
or
made by two sides
and
.
So
and
this two sides include 
Answer:
(Some textbooks describe a proportional relationship by saying that " y varies proportionally with x " or that " y is directly proportional to x .") This means that as x increases, y increases and as x decreases, y decreases-and that the ratio between them always stays the same.
Step-by-step explanation:
google
and I know that the second one is the answer I dont know the others
Cut 5/12 of his lenght
remain 7/12 of his lenght
7/12*L - 6/7 *7/12*L=2 1/2 m
7/12*L(1-6/7)=7/12*L(7/7-6/7)=7/12*L*1/7=L/12 =2 1/2
⇒L=2 1/2 m *12=5/2*12=30 m
Original length was 30 m