Find the average of number of laptops sold by all the

The memory-less property is followed by which of the following continuous distribution:

The square of normal variate with mean 0 and variance 1 follows:

For the random variable X with probability density function f(x) = (x−3)² /5; x = 3, 4, 5, the variance of X is:

The variation among the observations of each specific class is known as:

If the first, second, and third moment about the origin are 2, 8, and 18 respectively, then third moment about mean is

For frequency distribution presentation , which option is wrong.

For a distribution, mean is 40, median is 40.5 and mode is 41. The distribution is:

From standard pack of 52 cards, 3 cards are drawn at random without replacement. The probability of drawing a king, a queen and a jack in order is

If mean and median of the distribution are 12 and 21, then the distribution