Of the total number of capacitors in the store, 60% are designed for an operating voltage of 200 V, 30% for 400 V

Of the total number of capacitors in the store, 60% are designed for an operating voltage of 200 V, 30% for 400 V, and the rest for 600 V. What is the probability that a capacitor taken at random will be rated for a voltage of at least 400 V?

Solution: P = 0.3 + 0.1 = 0.4.

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