... 14. The scores on a standardized mathematics test for 8th-grade children in New York State form a normal distribution with a mean of u deviation of o = 10. a. What proportion of the students in...

Extracted text: ... 14. The scores on a standardized mathematics test for 8th-grade children in New York State form a normal distribution with a mean of u deviation of o = 10. a. What proportion of the students in the state have 70and a standard = 20, ard 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 %3D aple is means lesS than M = 75?