# Question: The lifetimes of interactive computer chips produced by a certain

The lifetimes of interactive computer chips produced by a certain semiconductor manufacturer are normally distributed with parameters μ = 1.4 × 106 hours and σ = 3 × 105 hours. What is the approximate probability that a batch of 100 chips will contain at least 20 whose lifetimes are less than 1.8 × 106?

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