Average and Standard Deviation : Mathematics Objective Questions
Sunday, February 1st, 20091. The average age of students of a class is 15.8 years. The average age of boys in the class is 16.4 years and that of the girls is 51.4 years. The ratio of number of boys to the numbers of girls in the class is a) 1 : 2 b) 3 : 4 c) [...]