ÌâÄ¿ÄÚÈÝ

ij¸ßУ´Ó½ñÄê²Î¼Ó×ÔÖ÷ÕÐÉú¿¼ÊÔµÄѧÉúÖÐËæ»ú³éÈ¡ÈÝÁ¿ÎªµÄѧÉú³É¼¨Ñù±¾£¬µÃµ½ÆµÂÊ·Ö²¼±íÈçÏ£º
×éÊý
·Ö×é
ƵÊý
ƵÂÊ
 µÚÒ»×é
[230,235£©
8
0.16
µÚ¶þ×é
[235,240£©

0.24
µÚÈý×é
[240,245£©
15

µÚËÄ×é
[245,250£©
10
0.20
µÚÎå×é
[250,255]
5
0.10
ºÏ¼Æ

1.00
£¨1£©ÇóµÄÖµ£»
£¨2£©ÎªÁËÑ¡°Î³ö¸ü¼ÓÓÅÐãµÄѧÉú£¬¸Ã¸ßУ¾ö¶¨ÔÚµÚÈý¡¢ËÄ¡¢Îå×éÖÐÓ÷ֲã³éÑùµÄ·½·¨³éÈ¡6ÃûѧÉú½øÐеڶþÂÖ¿¼ºË£¬·Ö±ðÇóµÚÈý¡¢ËÄ¡¢Îå×é²Î¼Ó¿¼ºËµÄÈËÊý£»
£¨3£©ÔÚ£¨2£©µÄÇ°ÌáÏ£¬¸ßУ¾ö¶¨´ÓÕâ6ÃûѧÉúÖÐÔñÓżȡ2ÃûѧÉú£¬Çó2ÈËÖÐÖÁÉÙÓÐ1ÈËÊǵÚËÄ×éµÄ¸ÅÂÊ£®
£¨1£©£¨2£©3,2,1  (3£©

ÊÔÌâ·ÖÎö£º£¨1£©ÓɵÃn=50£»Óɵ㬣¨2£©¸ù¾Ý¸÷×éÕ¼×ÜÊýµÄ°Ù·Ö±È³éÈ¡¼´¿É£¨3£©´ÓÕâ6ÃûѧÉúÖÐÈ¡2ÃûѧÉúµÄÈ¡·¨×ÜÊýn==15£¬2ÈËÖÐÖÁÉÙÓÐ1ÈËÊǵÚËÄ×éµÄÈ¡·¨ÓÐ=9£¬¸ù¾ÝËæ»úʼþµÄ¸ÅÂʹ«Ê½ÇóÖ®¼´¿É.
ÊÔÌâ½âÎö£º
£¨2)µÚÈý×éÈ¡3ÈË,µÚËÄ×éÈ¡2ÈË,µÚÎå×éÈ¡1ÈË,     6·Ö
(3)´ÓÕâ6ÃûѧÉúÖÐÈ¡2ÃûѧÉúµÄÈ¡·¨×ÜÊýn=15£¬2ÈËÖÐÖÁÉÙÓÐ1ÈËÀ´×ÔµÚËÄ×éµÄÈ¡·¨m=9,¼ÇʼþA¡°ËùÈ¡2ÈËÖÐÖÁÉÙÓÐ1ÈËÀ´×ÔµÚËÄ×顱£¬Ôò
              12·Ö
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿

Î¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨µç»°£º027-86699610 ¾Ù±¨ÓÊÏ䣺58377363@163.com

¾«Ó¢¼Ò½ÌÍø