please provide step to step formula

9. An amount was invested at r% per quarter. What value of r will ensure that accumulated amount at the end of one year is 1.5 times more than amount invested? Correct to 2 decimal places Ans: 10. The average mark of candidates in an aptitude test was 138.5 with a standard deviation of 10.6. Three scores extracted from the test are; 178, 122, 100. What is the average of the extracted scores that are extreme values (outliers)? Correct your answer to the nearest whole number. Ans