The manager of a restaurant in Malacca claims that waiters working in all restaurants in Malacca earn an average of RM150 or more in tips per week. A random sample of 25 waiters selected from restaurants of Malacca yielded a mean of RM139 in tips per week with a standard deviation of RM28. Assume that the weekly tips for all waiters in Malacca have a normal distribution. Using 1% significance level, can you conclude that the manager’s claim is true?
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