The lifespans of seals in a particular zoo are normally distributed. the average seal lives 13.8 years; the
standard deviation is 3.2 years.
use the empirical rule (68 - 95 - 99.7%) to estimate the probability of a seal living less than 7.4 years.

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.