6. The marks (out of 100) obtained by a group of students in a science test are 85, 76, 90, 85, 39, 48, 56, 95, 81 and 75. Find the:
(i) Highest and the lowest marks obtained by the students.
(ii) Range of the marks obtained.
(iii) Mean marks obtained by the group.
Given,
Marks obtained the students =
Arranging in ascending order =
(i) Highest marks obtained =
Lowest marks obtained =
(ii) Range of marks = Highest marks - Lowest marks
(iii) We know, Arithmetic mean
Therefore, mean marks =