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

A teacher analyses the performance of two sections of students in a mathematics test of 100 marks given in the following table : : Find the probability that a student obtained less than 20 marks in the mathematics test.

A teacher analyses the performance of two sections of students in a mathematics test of 100 marks given in the following table. Find the probability that a student obtained less than 20 in the mathematics test.

A teacher analyses the performance of two sections of students in a mathematics test of 100 marks given in the following table : : Find the probability that a student obtained less than 20% in the mathematics test.

The number of students in section X A and X B are 30 and 35 respectively. The mean scores of students in the mathematices test are as follows:

Following are the marks obtained by 9 students in a mathematics test : 50, 69 , 20, 33, 53, 39, 40, 65 and 59 The mean deviation from the median is …………

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 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 (a) 4550quad (c) 51.4 approx.(d)54.6 approx.