If the data follows a normal distribution:
Less than 13 ( less than a mean - 1 sigma ): 16% of a population.
0.16 · 200 = 32
Greater than 14 ( 14 is a mean value ): 50% of a population.
0.5 · 200 = 100
Answer:
... about 32 people have hemoglobin levels less than 13, and about 100 people have hemoglobin levels greater than 14.
40+1=41
10×4+1=41
that is what I have so there you go
We need to solve the following system by substituition:

To solve by substituition means that we need to isolate one variable in one of the equations and replace one expression with the other. This is done below:

Then we need to replace the value of "x" in any of the two equations.

The solution is (-3,-5).
You could set up a ratio:

which then becomes: