6.50 The athletic association of a school reports that the mens 100-meter run follows a normal distribution

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6.50 The athletic association of a school reports that the men’s 100-meter run follows a normal distribution with a variance of 1.58 seconds. A random sample of 23 records of the men’s 100-meter run are randomly selected. Find the probability that the sample variance exceeds 1.99 seconds.

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