Answer:
The mean for Z is 40.
The standard deviation for Z is 25.
Step-by-step explanation:
We are given the following in the question:
X: daily work hours.
The average daily work hours are 8 hours, with a standard deviation of 5.
Z denote weekly work hours.
We have to find the mean and standard deviation for Z.
The mean for Z is 40.
We use the property:
Thus, the standard deviation for Z is 25.
Let Tritt's age = t & Jan's age = 2t - 3
if the sum of their ages equals 30 then..
combine terms and simplify
now simply divide
and to find Jan's age just plug 9 in
Jan's age = 15
Tritt's age = 9
Answer:
a) 
b) 
Step-by-step explanation:
Since 
, through the Alternate Angle Theorem, 
. We can solve for x by setting up an equation where both angles are equal to each other:
Now plug in x for both of the formulas to get their angles:
Area of a right triangle is equal to (the length times the height) divided by 2
So the area of each tile is (3 x 3) / 2 = 4.5 square centimeters
200 tiles equal 200 x 4.5 = 900 sq cm
