If the mean age at diagnosis of all people with early onset

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If the mean age at diagnosis of all people with early onset dementia is 55 years, find the probability that a random sample of 21 such people will have a mean age at diagnosis less than 52.5 years. Assume that the population standard deviation is 6.8 years. State any assumptions that you are making to solve this problem.

Reference no: EM13628488

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