NDA Government Jobs Exams

Marks obtained by 7 students in a subject are 30, 55, 75, 90, 50, 60, 39. The number of students securing
marks less than the mean marks is
(a) 7 (b) 6 (c) 5 (d) 4

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NDA Other Question

The average marks obtained by the students in a class are 43. If the average marks obtained by 25 boys are
40 and the average marks obtained by the girl students are 48, then what is the number of girl students in the
class ? Variance is always independent of the change of
(a) origin but not scale (b) scale only (c) both origin and scale (d) None of the above