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The credit manager of a discount department store believes that the average age of his charge account customers is less than 40 years. A random

The credit manager of a discount department store believes that the average age of his charge account customers is less than 40 years. A random sample of 100 charge account customers revealed an average age of 36 years and a standard deviation of 10 years. Do these data provide sufficient evidence to support the credit manager's belief?

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