4. The scores on a standardized mathematics test for 8th-grade children in New York State form a normal distribution with a mean of u = 70 and a standard deviation of o = 10. a. What proportion of the students in the state have scores less than X = 75? b. If samples of n = 4 are selected from the popula- tion, what proportion of the samples will have means less than M 75? c. If samples of n = 25 are selected from the popu- lation, what proportion of the samples will have means less than M 75? ||

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