When a wave passes from a less dense medium to a denser one, most of the wave energy is
A. reflected.
B. diffracted.
C. absorbed.
D. refracted.

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. in a survey conducted in an office, 60% of the sample respondents agreed that employees should have flexible working hours. if the margin of error is ±2%, the expected population proportion that wants flexible working hours is between __% and __%