10 the stat & probability

The mean of 100 observations is is 40. Standard deviation is 3 . the sum of square of all deviations is

If the standard deviation of x, y, z is p then the standard deviation of 3x + 5, 3y+ 5, 3z+ 5 is

A purse contain 10 notes of ₹2000.15 notes of ₹500.25 notes of ₹200. what is probability that note iseither ₹500 or ₹200

Which of the following is not a measure of dispersion?

If the mean and coefficient of variation of a data are 4 and 87.5% then the standard deviation is

Kamalam went to play'lucky draw contest'. 135 ticket were sold. if she winning is 1/9 then number of ticket bough by?

The sum of all deviations of the data from its mean is

The probability of getting a job is x/3 .If the probability of not getting the job is 2 /3 then the value of x is

A page selected random from a book. The probability that the digit at unit place of page number chosen is less than 7 is

The range of the data 8, 8, 8, 8 .........8 is

Variance of the 20 natural numbers is

The probability a red marble is selected at random from a jar containing 'p' red,'q' blue and 'r' green Marbles is

If a letter is chosen at random from the English alphabet then the probability that the letter chosen precedes x

Which of the following is incorrect?

The standard deviation of a data is 3. If each value is multiplied by 5 then the new variance is