for a certain aptitude test it is known from past, Basic Statistics

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for a certain aptitude test it is known from past

For a certain aptitude test, it is known from past experience that the average score is 1000 and the standard deviation is 125. If the test is administered to 100 randomly selected individuals, what is the probability that the value of the average score for this sample will lie in the internal 970 and 1030? Assume that the population distribution is normal.

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