How do we calculate the "range" of the measurements?

a) subtract the smallest value from the largest value
b)subtract the largest value from the smallest value
c)add up all the measurements
d)add up all the measurements and divide by the number of measurements

Which of the following is part of the explanation or description of electromagnetic waves? (select all that apply) a. electrically charged molecules in a medium transfer their energy to nearby electrically charged molecules. b. a changing electric field causes a changing magnetic field. c. magnetic molecules in a medium transfer their energy to nearby magnetic molecules. d. a changing magnetic field causes a changing electric field.