What does a large standard deviations in a date set mean? a. almost all of the date are very close to the median value b. the percent error is close zero c. dare points lend to be far from the average value d. the average of the date points cannot be determined

C. A high standard deviation means that the average distance from the data points to the mean is high, which is what C says.

Vander waals forces are inter molecular bonds that exist within molecules of the same substance. a water molecule is made up of oxygen and hydrogen atoms which share electrons between each other. the vander waals forces are forces that exist between multitude of different  molecules of water. dipole dipole forces is the type of vander waals force that exist in water. the oxygen atom which is more electronegative pulls the shared electron closer to itself thus generating a partial negative charge while the hydrogen acquire a partial positive charge. these two different charges causes attraction to occur in water molecules.