Standard Deviation

(a) 7.42 (b) 9.45 (c) 12.33 (d) 15.36 (e) 20.12 olution: There is no data in this question. Skip this question and this test has total mark = 97. A( sample) of 100 students has the following test scores: 50, 60, ..., 70. Given that 50+60+...+70=600 and 502 +602 +... + 702 =25875. The sample standard deviation is closest to n = 100 52= - 25875 - 1 (600)2 (a) 5 (b) 10 (c) 12.5 (d) 15 (e ) 20 x = 606 99 A group of 50 students consists of 30 girls and 20 boys. The median test score for the girls is 8 ants is most correct