Four people in abes family are traveling to canada for their vacation. they have four seats in the center section of the plane. abe wants to sit beside his brother ben in how many ways can the 4 people be seated so that ben abe can sit next to each

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?