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Delta's key the toefl test part 46

Tham khảo tài liệu 'delta's key the toefl test part 46', ngoại ngữ, toefl - ielts - toeic phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Quiz 7 I ASSESSING PROGRESS - 5.5 through 3.6 Quiz 7 Time -15 minutes Read the following passages and choose the one best answer to each question. Answer all questions on the basis of what is stated or implied in that passage. Questions 1-4 The mathematics of chance the mathematical description of randomness is called the theory of probability. Probability describes the predictable long-run patterns of random outcomes. Toss a coin in the air. Will it land heads or tails It lands sometimes heads and 5 sometimes tails. We cannot say what the next fall will be. Perhaps you would argue that the coin has an equal chance of falling heads or tails on the next toss. Suppose that we toss a coin not once but ten thousand times. John Kerrich an English mathematician actually did this while a prisoner of World War II. Kerrich s first ten tosses gave four heads a proportion of 0.4. The proportion of heads increased to 0.5 10 after twenty tosses and to 0.57 after thirty tosses. In a small number of tosses the proportion of heads fluctuates it is still essentially unpredictable. However many tosses will produce a smoothing effect. A proportion of 0.507 resulted after Kerrich threw the coin five thousand times. Moreover in all ten thousand trials he again scored 0.507 of the total. After many trials the proportion of heads settled down to a fixed 15 number. This number is the probability of a head. Reading 1. What is the purpose of the passage 3. Where in the passage does the author summarize Kerrich s experiment W To illustrate a theory V To compare a theory and an experiment 2 To outline a procedure TT To explain why a coin toss favors heads 2. It can be inferred from paragraph 2 that æ Lines 1-3 Lines 4-5 c Lines 7-9 TT Lines 13-15 W we cannot guess the result of a coin toss T how a coin lands depends on its monetary value T a coin has an equal chance of falling heads or tails a coin has two sides heads and tails 4. With which of the following statements would the author most .