## Algebra 2 (1st Edition)

$16\%$
As we can see, these are half the elements that are at least $1$ standard deviation away from the mean. The normal distribution is symmetric about the mean, thus using the 68-95-99.7 rule and the graph we get: $P(\overline{x}+\sigma\leq x)=13.5\%+2.35\%+0.15\%=16\%$