The following are the scores of two groups of class `9^(th)` students in a test of `MATHEMATICS.`

Calculate the mean of the scores of 20 students in a mathematics test

Calculate the mean of the scores of 20 students in a mathematics test

The average of the test scores of a group of x students is 76 and the average of the test scores of a group of y students is 90. When the scores of the two groups of students are combined, the average test score is 85. What is the value of of (x)/(y) ?

The arithmetic mean of the scores of a group of students in a test was 52. The brightest 20% of them secured a mean score of 80 and the dullest 25% a mean score of 31. The mean score of remaining 55% is :

The following table given the marks scored by 50 students in a 100 marks test of Mathematics. {:("Marks",0-20,20-40,40-60,60-80),("No of "3,12,18,10,7),("students",,,,):} A student is selected randomly from the class. Find the probability that the selected student.

The pie chart given shows the number of marks scored by a student in the given 5 subjects. The total marks scored by the student is 480. In which of the following 2 subjects the sum of marks scored by the student is equal to the marks scored in Mathematics?

The average of the test scores of a class of m students is 70 and that of n students is 91. When the scores of both the classes are combined, the average is 80. What is n/m?