ابغى طريقة حل الأسئلة التالية :
a person owns a collection of 25 movies, five of which are english. If four movies
are selected at random, find the probability that three of them are english
the average height of apple trees in a garden is 10.5 feets. If the heights are
normally distributed with a standard deviation of 3, find the percentage that a tree is
less than 12.5 feets tall
the average weight of books on a library f is 8.3 grams. The standard deviation
is 0.6 grams. If 20% of the books are oversized , find the minimum
weight of the large books on the library f. Assume the variable is normally
distributed.
find two z values so that 41.08% of the middle area is bounded by them
