# Statistics Question - What percent falls above 105?

J

Re: Statistics

Using a standard normal table, the probability of exceeding 1 sigma = 1-0.8413 or .1587

Using Excel:
=1 - normsdist(1)

#### Jim Wynne

Staff member
Re: Statistics

Another way to put it that might be more illustrative is that in a "perfect" normal distribution, we can expect 68.26% of the population to fall within ?1 standard deviation of the mean. Because the question concerns only "plus" values, we know that 34.13% will fall between 100 and 105 inclusive. That leaves 50% (the upper half of the population) minus 34.13% to account for values greater than 105, or 15.87%

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