Answer:
a) P(x = 110) = 0
b) 
Step-by-step explanation:
We are given the following information in the question:
Mean, μ = 109
Standard Deviation, σ = 2
We are given that the distribution of blood chloride concentration is a bell shaped distribution that is a normal distribution.
Formula:
a) P( chloride concentration equals 110)
P(x = 110) = 0
Because in a continuous distribution probability at one point is always zero.
P(chloride concentration is less than 110)
Calculating the value from the standard normal table we have,
P(chloride concentration is at-most 110)
Calculating the value from the standard normal table we have,
b) P(chloride concentration differs from the mean by more than 1 standard deviation)
P( 109 > x > 111) = 1 - P( 109 < x < 111)

Clearly, this probability depend on the values of μ and σ.