There are 150 calories in a cup of whole milk and only 80 in a cup of skim milk. In switching to skim milk, find the percent decrease in number of calories. The percent decrease is %. (Round to the nearest tenth if needed.)

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

What is the range of the relation in the table below? x y –2 0 –1 2 0 4 1 2 2 0

Starting at home, emily traveled uphill to the hardware store for 606060 minutes at just 666 mph. she then traveled back home along the same path downhill at a speed of 121212 mph. what is her average speed for the entire trip from home to the hardware store and back?