An electrical firm manufactures a 100-watt light bulb, which, according to specifications written on the package, has a mean ife of 500 hours with a standard deviation of 40 hours. At most, what percentage of the bulbs fail to last even 340 hours? Assume that the distribution is symmetic about the mean According to Chebyshev's theorem, at most% of the bulbs fail to last even 340 hours (Type an integer or a decimal. Do not round.)

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