Find the indicated area under the curve of the standard normal distribution; then covert it to a percentage and fill in the blank. About ___% of the area is between z=-2 and z=2 (or within 2 standard deviations of the mean)

Afootball is throw by a quarterback to a receiver

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.

The distance a bicycle travels with each turn of its wheels is about 3 1/7 times the tire diameter. the tires on mike’s bicycle have a diameter of 24 1/2 inches. how far does it travel with each turn of the wheels?