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確率・統計 (1)
本問を選択(Select this problem){ する(Yes)，しない(No) } No.
正しい硬貨を4回独立に投げ、それぞれ表(T)か裏(H)が出るとする。表(H)の現れる回数をXで示す。( A fair coin is independently tossed four times. Each toss generates head (H) or tail (T) as the result. LetX be the times of H. )
1. Pr(X = 2)を求めよ。( Obtain the value of Pr(X = 2). )
2. Xの確率関数を示し、そのグラフを描け。( Find the probability function ofX, and draw the graph of the function.)
3. Xの各値の確率の和は1になることを示せ。( Show that the sum of probabilities of allX’s is 1.)
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