RRB NTPC Exam

 RRB NTPC - QUANT STATISTICS 1. A distribution consists of two components with sizes 300 and 200, having their means 16 and 8 respectively. The combined mean is 1) 12 2) 12.8 3) 12.7 4) 12.5 2. The arithmetic mean of the marks of 150 students in a class is 75 and the arithmetic mean of the marks of 50 students of them is 60, then the arithmetic mean of the marks of the rest of the students 1) 82 2) 82.5 3) 82.7 4) 80 3. The mean mark of boy in a particular subject was 80 and that of girl was 65. The average mark of all the students was 74. The ratio of boy to girl is 1) 3:2 2) 2:3 3) 1:3 4) 3:1 4. The arithmetic mean of the income of 100 workers in a factory is Rs.125 per day and the arithmetic mean of the income of 75 workers of them is Rs.100 per day .Then the arithmetic mean of the income of rest of the workers per day is 1) 160 2) 150 3) 170 4) 200 5. If AM of 25 observations is 12 then each ob...