Find the indicated area under the curve of the standard normal distribution; then convert it to a percentage and fill in the blank. about % of the area is between zequals=minus−1 and zequals=1 (or within 1 standard deviation of the mean). about nothing% of the area is between zequals=minus−1 and zequals=1 (or within 1 standard deviation of the mean).

The bottom of ignacio's desktop is 74.5cm from the floor. ignacios sits in his adjustable chair, and the tops of his legs are 49.3cm from the floor. each clockwise rotation of the knob on the chair raises ignacio's legs by 4.8cm. write an inequality to determine the number of clockwise rotations, r, ignacio could make with the knob without his legs touching the desk.