For a survival study with censored and truncated data, you are given: Number at Risk Time (t) at Time t Failures at Time t 1 30 5 2 27 9 3 32 4 25 20 4 • The probability of failing at or before Time 4, given survival past Time 1, is 34. Calculate Greenwood's approximation of the variance of 3ĝ. (A) 0.0067 (B) 0.0073 (C) 0.0080 (D) 0.0091 (E) 0.0105

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