The length in hours $X$ of lightbulb A is $N(800,14400)$ and $Y$ (lightbulb B) is $N(850,2500)$. Find the probability that at least one of the bulbs lives for at least 920 hours.
Would this be:
$$(1 - P(X < 920)) * (1 - P(Y < 920))$$
2026-04-06 10:45:01.1775472301
Find the probability that at least one of two light bulb survives for 920 hours.
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