4.某校参加校园青春健身操比赛的16名运动员的身高如表:
则该校16名运动员身高的平均数和中位数分别是(单位:cm)( )
| 身高(cm) | 172 | 173 | 175 | 176 |
| 人数(个) | 2 | 7 | 3 | 4 |
| A. | 174cm,173cm | B. | 173cm,174cm | C. | 174cm,174cm | D. | 174cm,175cm |
3.
如图,由3个大小完全一样的正方体组成的几何体的主视图是( )
0 294404 294412 294418 294422 294428 294430 294434 294440 294442 294448 294454 294458 294460 294464 294470 294472 294478 294482 294484 294488 294490 294494 294496 294498 294499 294500 294502 294503 294504 294506 294508 294512 294514 294518 294520 294524 294530 294532 294538 294542 294544 294548 294554 294560 294562 294568 294572 294574 294580 294584 294590 294598 366461
| A. | B. | C. | D. |