Consider the following statements:
1. The derivative where the function attains maxima or minima must be zero
2. If a function is differentiable at a point, then it must be continuous at that point.
Which of the above statements is/are correct ?
(a) 1 only (b) 2 only (c) Both 1 and 2 (d) Neither 1 nor 2
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