For the following questions answer them individually
For a given data, if the mean is 60 and the mode is 66, then the median is
The mode of the following data is
6, 9, 13, 10, 16, 13, 13, 14, 15, 11, 13, 12, 14
If $$\sigma$$ is the standard deviation of $$x_1, x_2, ...... x_n$$, then the standard deviation of $$9 + 3x_1, 9 + 3x_2, ....., 9 + 3x_n$$ is
A number is selected at random from the first 80 natural numbers. The probability that it is divisthle by 4 or 6 is
Two fair dice are rolled. The probability that the sum of the numbers on the faces shown is 8 is
The probability that either of the events A and B to happen is 0.6 and the probability that both of them to happen is 0.2. Then P(A‘) + P(B') =
(Here A’ is the complementary event of A.)
Suppose f(x) = (x - 2)(x - 5)(x - 7).
If a number $$\alpha$$ is chosen from {1, 3, 4, 5, 6, 7, 8, 9, 10} randomly, the probability that it satisfies the equation $$f(\alpha) = 0$$, is