Math Problem Statement
每次抽卡成功率2%,如果连续失败70次,之后每次抽卡成功率均会提高10%,第80次抽卡必定成功,则平均抽卡多少次可以成功
Solution
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Math Problem Analysis
Mathematical Concepts
Probability
Expected Value
Binomial Distribution
Formulas
Expected value formula: E(X) = Σ P(success on i-th trial) * i
Binomial probability formula: P(k successes in n trials) = C(n, k) * p^k * (1-p)^(n-k)
Theorems
Law of Total Expectation
Suitable Grade Level
Grades 10-12
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