In a certain orchard, the number of apples (a) in a tree
is normally distributed with a mean of 300 apples and
a standard deviation of 30 apples. Find the probability
that a given tree has between 300 and 390 apples.
99.7%
-95%-
-68%-
210 240 270 300 330 360 390
P(300 < a <390) = [ ? ]%
Be sure to use the 68% - 95% -99.7% rule and do not round.