Today i c um me d after 10 days​

Use the empirical rule. the mean speed of a sample of vehicles along a stretch of highway is 70 miles per hour, with a standard deviation of 4 miles per hour. estimate the percent of vehicles whose speeds are between 66 miles per hour and 74 miles per hour. (assume the data set has a bell-shaped distribution.)

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration