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English Senior High

BとDを教えてほしいです

Suppose you were asked to participate in a blind taste-test of five different brands of strawberry jam. After tasting all of the jams, but before being asked to rate their quality, you spend a couple of minutes ( I 1 ) down your reasons for liking and disliking each jam. Then you rate each one on a scale from 1 to 9. How accurate would your ratings be, assuming we judged accuracy by comparing your ratings with those given bya panel of experts assembled by Consumer Reports magazine? When psychologists Timothy Wilson and Jonathan Schooler conducted this experiment with college students as their subjects, they found that the ratings the students gave to the jams had almost no resemblance to , those given by the experts. 2 They should have been able to tell which ones were good and which ones were not the jams varied widely in quality and included those ranked 1st, 11th, 24th, 32nd, and 44th best out of 45 that Consumer Reports had reviewed. Did the students have no taste for jam? Did their preferences differ from the experts'? Not at all. In a separate condition of the experiment, rather than writing the reasons they liked and disliked each jam, each subject wrote about something entirely ( 4 ): their reasons for choosing their college major. The subjects then rated the jams, and despite not having thought about them at all after tasting them, they made ratings that were much closer to those of the experts.

Unresolved Answers: 0
Mathematics Senior High

上から3行目、Wの確率がどうしてこのように表せるのかわかりません😭😭😭 教えてください!!

重 |袋Aには赤球10個,白球5個,青球3個;袋Bには赤球8個,白球4個, 青球 6個:袋Cには赤球4個,白球3個,青球5個が入っている。 13つの袋から1つの袋を選び,その袋から球を1個取り出したところ白球であっ た。それが袋Aから取り出された球である確率を求めよ。 sb s 9 基本 62 日 指針>袋Aを選ぶという事象をA,白球を取り出すという事象を Wとすると,求める確率は P(WNA) P(W) 条件付き確率 Pw(A)= とって、P(W), P(ANW)がわかればよい。まず, 事象 Wを3つの排反事象 11 Aから白球を取り出す, [2] Bから白球を取り出す, [3] Cから白球を取り出す に分けて,P(W)を計算することから始める。また P(ANW)=P(A)P((W) である。 解答 R はすれ 本のくを 袋A, B, C を選ぶという事象をそれぞれ A, B, Cとし, 白球 |0 複雑な事象 を取り出すという事象を Wとすると | 排反な事象に分ける P(W)=P(ANW)+P(BnW)+P(Cnw) =P(A)PA(W)+P(B)Pa(W)+P(C)Pd(W) 1 加法定理 %3((乗法定理す3 い。 る受15 1.4 3 18 1 B C A 5 27 1 3 2 ニ 三 12 4 ANWBOW CNW WV5 2 54 3 18 3 12 54 よって,求める確率は 4S Pw(A)= 27 12 P(ANW)_P(A)Pa(W)_5 10 1 P(W) P(W) 54 4 27 Onanuoko 0() になる A- * イ 中理 1|4 II

Unresolved Answers: 1