百度试题 结果1 题目A fair coin is tossed 3 times. What is the probability of at least two consecutive heads? C( A)1/8 (B) 1/4 ( C ) 3/8 (D) 1/2 (B) 3/4 相关知识点: 试题来源: 解析 C 反馈 收藏
一枚硬币掷3次,每次都有正反两种可能,所以总共有2^3=8种可能的结果。 第二步,我们计算至少有2次连续正面朝上的结果数。这种情况有3种可能:正正反、正正正、反正正。 第三步,我们根据条件概率的公式,计算至少有2次连续正面朝上的概率。概率等于满足条件的结果数除以总的结果数,即3/8。
A fair coin is tossed repeatedly. The probability that the first head occurs on the nth toss is P(n)=(12)^n. When this game is repeated many times, the average number of tosses required until the first head occurs isE(n)=∑limits_(n=1)^∞nP(n).(This value is called theexpected...
A fair coin is tossed 100 times. The probability of getting tails an odd number of times is 1//2 b. 1//8 c. 3//8 d. none of these
百度试题 题目If a fair coin is tossed twice, what is the probability of obtaining heads both times? A. 1/4. B. 1/2. C. 3/4. D. 1.相关知识点: 试题来源: 解析 A 略 反馈 收藏
• The formula of conditional probability: Pr( A B) Pr A Bor Pr A B Pr(A B)Pr(B) Pr(B) • The formula of independent probability: Pr(A B) Pr(A) Pr(B) Two classical trials: toss a fair coin: roll a fair die: Head ...
If a fair coin is tossed twice, what is the probability of obtaining heads both times?A. 1/4.B. 1/2.C. 3/4.D. 1. 正确答案:A 分享到: 答案解析: The probability of tossing a head, H, is P(H) = 1/2. Since these are independent events, the probability of two heads in a ...
A fair coin is tossed independently twice. The random variable��counts the number of heads��that appeared. Compute the cumulative distribution��(��)of��.
3. Suppose that a fair coin (probability of heads equals1/2)is tossed independently 10 times. Use the table of the binomial distribution given at the end of this book to find the probability that strictly more heads are obtained than tails. 相关知识点: 试题来源: 解析 3.0.377. 反馈...
7. When a fair coin is tossed six times, the chance of getting 1 or 2 heads is exactly equal to the chance of getting 0 or 3 heads. 8. When a fair coin is tossed and the number of heads recorded, the chance error expressed as a ...