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Answers for “为什么 100% 等于 1?”

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Understand why

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100% equals 1 because it represents the fraction 100/100100/100. When the numerator and denominator of a fraction are the same nonzero number, the value of the fraction is exactly one whole.

Conditions: The percentage value is 100.; The denominator is 100.

Understand why

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The expected number of heads is 50 because the expected value for a counting experiment like this is calculated as the number of trials multiplied by the probability of success on each trial. With 100 tosses and a fair coin (probability of heads = 0.5), the calculation is 100⋅0.5=50100 \cdot 0.5 = 50.

Conditions: The coin is fair.; There are 100 tosses per trial.; XX counts heads.

Understand why

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An equality constraint is used because the customer order requires exactly 1000 units to be supplied. The problem specifies that the order must be met precisely, meaning neither underproduction (shortfall) nor overproduction (surplus) is permitted.

Conditions: The problem involves fulfilling a specific customer order.; The order quantity is fixed and must be met exactly.; Overproduction or underproduction is not allowed or desired.

Understand why

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The example concludes this because the conditional expectation of the discounted time-3 stock price, given information at time 2, equals the discounted time-2 stock price. Specifically, E2[S3(1+r)3]=82.64\mathbb{E}_2\left[\frac{S_3}{(1+r)^3}\right] = 82.64 and S2(1+r)2=82.64\frac{S_2}{(1+r)^2} = 82.64, satisfying the martingale condition Mn=En[Mn+1]M_n = \mathbb{E}_n[M_{n+1}].

Conditions: The expectation is taken under the risk-neutral probability p=2/3p = 2/3.; Discounting uses the interest rate r=0.1r = 0.1.

Understand why

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The sample mean converges to 50 because 50 is the expected value E(X)E(X) of the random variable XX (number of heads in 100 fair-coin tosses). According to the law of large numbers, as the number of trials nn approaches infinity, the sample mean X‾n\overline{X}_n approaches the expected value.

Conditions: The coin is fair.; XX counts heads after 100 tosses.; nn approaches infinity.

Understand why

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The state prices ψj\psi_j represent the prices of Arrow-Debreu securities, which are monetary values and do not necessarily sum to 1. The transformed vector qjq_j represents risk-neutral probabilities, obtained by multiplying each state price by the gross risk-free factor (1+i)(1+i).

Conditions: The market is a one-period finite-state model.; ψj\psi_j are the solved state prices (Arrow-Debreu security prices).; ii is the per-period risk-free interest rate.; qjq_j is defined as qj=(1+i)ψjq_j = (1+i)\psi_j.