题干

在一次科技作品制作比赛中,某小组八件作品的成绩(单位:分)分别是 6,9,9,8,6,9,9,8,对于这组数据,下列说法不正确的是(  )

A:中位数是8

B:众数是9

C:平均数是8

D:方差是1.5

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答案(点此获取答案解析)

A

同类题2

阅读理解

    Your house may have an effect on your figure . Experts say the way you design your home could play a role in whether you pack on the pounds or keep them off . You can make your environment work for you instead of against you . Here are some ways to turn your home into part of diet plan.

    Open the curtains and turn up the lights . Dark environments are more likely to encourage overeating , for people are often less self-conscious(难为情)when they're in poorly lit places-and so more likely to eat lots of food . If your home doesn't have enough window light, get more lamps and flood the place with brightness.

    Mind the colors. Research suggests warm colors fuel our appetites. In one study, people who ate meals in a blue room consumed 33 percent less than those in a yellow or red room . Warm colors like yellow make food appear more appetizing , while cold colors make us feel less hungry . So when it's time to repaint, go blue.

    Don't forget the clock-or the radio. People who eat slowly tend to consume about 70 fewer calories(卡路里) per meal than those who rush through their meals. Begin keeping track of the time, and try to make dinner last at least 30 minutes, And while you're at it, actually sit down to eat. If you need some help slowing down, turn on relaxing music. It makes you less likely to rush through a meal.

    Downsize the dishes. Big serving bowls and plates can easily make us fat. We eat about 22 percent more when using a 12-inch plate instead of a 10-inch plate. When we choose a large spoon over a smaller one ,total intake(摄入) jumps by 14 percent. And we'll pour about 30 percent more liquid into a short, wide glass than a tall, skinny glass.

同类题4

阅读文言文,回答问题。

唐雎不辱使命

    【甲】秦王谓唐雎日:“寡人以五百里之地易安陵,安陵君不听寡人,何也?且秦灭韩亡魏,而君以五十里之地存者,以君为长者,故不错意也。今吾以十倍之地,请广于君,而君逆寡人者,轻寡人与?”唐雎对日:“否,非若是也。安陵君受地于先王而守之,虽千里不敢易也,岂直五百里哉?”

    秦王怫然怒,谓唐雎日:“公亦尝闻天子之怒乎?”唐雎对日:“臣未尝闻也。”秦王日:“天子之怒,伏尸百万,流血千里。”唐雎日:“大王尝闻布衣之怒乎?”秦王日:“布衣之怒,亦免冠徒跣,以头抢地耳。”唐雎曰:“此庸夫之怒也,非士之怒也。夫专诸之刺王僚也,彗星袭月;聂政之刺韩傀也,白虹贯日;要离之刺庆忌也,仓鹰击于殿上。此三子者,皆布衣之士也,怀怒未发,休祲降于天,与臣而将四矣。若士必怒,伏尸二人,流血五步,天下缟素,今日是也。”挺剑而起。

    秦王色挠,长跪而谢之日:“先生坐!何至于此!寡人谕矣:夫韩、魏灭亡,而安陵以五十里之地存者,徒以有先生也。”

(选自《唐雎不辱使命》)

    【乙】荆轲奉樊於期①头函,而秦武阳②奉地图匣,以次进。至陛③下,秦武阳色变振恐,群臣怪之,荆轲顾笑武阳,前为谢日:“北蛮夷之鄙人,未尝见天子,故振慑,愿大王少④假借⑤之,使毕使于前。”秦王谓轲曰:“起,取武阳所持图!”

    轲既取图奉之,发⑥图,图穷而匕首见。因左手把秦王之袖,而右手持匕首揕⑦(zhèn)之。未至身,秦王惊,自引而起,绝⑧袖。拔剑,剑长,操其室(剑鞘)。时恐急,剑坚(插得很紧),故不可立拔。

    荆轲逐秦王,秦王还⑨柱而走。群臣惊愕,卒⑩起不意,尽失其度。而秦法,群臣侍殿上者,不得持尺兵;诸郎中⑪执兵,皆陈殿下,非有诏不得上。方急时不及召下兵以故荆轲逐秦王,而卒惶急无以击轲,而乃以手共搏之。

(选自《荆轲刺秦王》)

【注释】①樊於期:秦国将领,因得罪秦王逊到燕国。②秦武阳:人名,又名秦舞阳,充任荆轲出使秦国的副手。③陛:殿前的台阶。④少:通“稍”。⑤假借:在文中是“原谅”的意思。⑥发:打开。⑦揕:用刀剑等刺。⑧绝:挣断。⑨还:通“环”,绕。⑩卒:“猝”,突然。⑪郎中:宫廷的侍卫。