NDA Government Jobs Exams

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 ?

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NDA Other Question

If θ is the angle between the vectors 4(i-k) and kˆ+ jˆ+ iˆ , then what is (sin θ + cos θ) equal to 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