Answer:
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The standard error of the mean is the standard deviation which is 6.50
Answer:

Step-by-step explanation:
Given : 
To Find : Which represents the empirical formula for
?
Solution:
Definition of Empirical Formula - A formula that gives the simplest whole-number ratio of atoms in a compound.

To reduce it in simplest form
Divide the subscript numbers by 3
So, the resultant : 
Thus the empirical formula for
:

64; Line pq is correspondent with line ab and triangle PQR is 4 time as big as triangle ABC.
The area of the base = 15 * 15 = 225 m2
ande tharea of each sloping triangular side = 1/2 * 15 * 18 = 135 m2
so total surface area = 225 + 4*135 = 765m2