单选题
Mr. Hernandez"s students filled out a survey asking how many hours each student watched television over 7 days. The results from the survey are shown below in a stem-and-leaf plot.
单选题
Which of the following is the median number of hours of television watched during the week?
【正确答案】
D
【答案解析】The median is the middle value in an ordered set of values. Based on the information given, the median of the set of values is 16.
单选题
If the volume of a cube is 64, what is the surface area of the cube?
【正确答案】
E
【答案解析】Recall that the volume of a cube is equivalent to side×side×side, or s
3
. If the volume is 64, then s
3
=64, and s=4. Because there are 6 faces on a cube, the surface area will equal 6 times one of the surfaces, which are squares with side s; the area of one face is s2. Therefore, the total surface area of the cube is 6s
2
, or 6(4
2
), or 6(16), which equals 96.