The concentration of a reactant is a random variable with probability density function
a. What is the probability that the concentration is greater than 0.5?
b. Find the mean concentration.
c. Find the probability that the concentration is within ±0.1 of the mean.
d. Find the standard deviation ? of the concentrations.
e. Find the probability that the concentration is within ±? of the mean.
f. Find the cumulative distribution function of the concentration.
Let X denote the concentration. The mean is 
= 0.34348. The standard deviation is ? = 0.26265.
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