The two-way frequency table represents data from a survey asking mall visitors whether they like seafood, meat, or both.
meat
not meat
seafood
not seafood
total
72
which is the joint relative frequency for mall visitors who like seafood and meat?

The distribution of a sample of the outside diameters of pvc pipes approximates a symmetrical, bell-shaped distribution. the arithmetic mean is 14.0 inches, and the standard deviation is 0.1 inches. about 68% of the outside diameters lie between what two amounts?