A study discussed that the percent purity of oxygen from a certain supplier yields a mean of 99.61% and a standard deviation of 0.08%. If the distribution of percent purity is said to be in normal distribution, what purity value exceed exactly 5% of the population?
We need to calculate the value of when the This is computed as follows
From the above we know that
.
Solving for we have
.
Substituting the values of and
we have the value of to be
Thus, the purity value that exceeds exactly 5% of the population is
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