17. The distribution of scores on the SAT is approxi mately normal with a mean of p. = 500 and a standard deviation of 0' = 100. For the population of students who have taken the SAT, 2!. What proportion have SAT scores less than 400? I). What proportion have SAT scores greater than 650'? 3. Find the estimated standard error for the sample mean for each of the following samples. a. n = 9 with SS: 1152 b. n = 16 with 53 = 540 c. n = 25 with SS = 600