If `bar x` is the mean and mean deviation from mean is MD`(bar x)`,then find the number of observations lying between `(bar x)-MD(bar x)` and `(bar x)+MD(bar x)`.Use the following date 22,24,30,27,29,31,25,28,41,42.

(a)Find the mean deviation from the median for the following data:22,24,30,27,29,31,25,28,41,42.

A random variable X has the following distribution function: Find the mean and the variance of the random variable x.

A random variable X has the following distribution function: Find the mean and the variance of the random variable.

n arithmetic means are inserted between x and 2y and then between 2x and y . If the rth means in each case be equal then find the ratio x/y.

The probability distribution of a random variable X in given in the following table: Find the mean of X.

X is a random variable which denotes the number of heads obtained when a coin is tossed three times.Find mean and variance of the probability distribution.

Two distinct numbers x and y are choosen from 1, 2, 3, 4, 5. The probability that the arithmetic mean of x and y is an integer is a)0 b)1/5 c)3/5 d)2/5

a) What is the number which gives midpoints of the points denoted by the numbers x and y on the number line. b) If the numbers x and y are thought of as points on a number line, what is the geometrical meaning of |x-y| ? c) .Find those x satisfying each of the equations below. i) |x-1|=|x-3| ii) |x-1|=|x+3| ifi) |x+1|=|x-3|